diff --git a/extra/mariabackup/CMakeLists.txt b/extra/mariabackup/CMakeLists.txt
index a71030887c43f..dff27afb0c44e 100644
--- a/extra/mariabackup/CMakeLists.txt
+++ b/extra/mariabackup/CMakeLists.txt
@@ -114,3 +114,28 @@ ADD_DEPENDENCIES(mbstream GenError)
 IF(MSVC)
   SET_TARGET_PROPERTIES(mbstream PROPERTIES LINK_FLAGS setargv.obj)
 ENDIF()
+
+
+########################################################################
+# mariadb-backup-server: BACKUP SERVER-compatible shell wrapper
+########################################################################
+# A drop-in mariadb-backup-compatible POSIX-sh wrapper that translates the
+# CLI into server-side BACKUP SERVER SQL. Experimental; OFF by default
+# Installed as a mariadb-backup-server; clients opt in via symlink/alias
+# (see extra/mariabackup/scripts/README.md).
+OPTION(WITH_MARIABACKUP_WRAPPER
+  "Install the BACKUP SERVER shell wrapper (mariadb-backup-server)" OFF)
+ADD_FEATURE_INFO(MARIABACKUP_WRAPPER WITH_MARIABACKUP_WRAPPER
+  "BACKUP SERVER-compatible mariadb-backup shell wrapper")
+
+IF(WITH_MARIABACKUP_WRAPPER AND NOT WIN32)
+  CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/scripts/mariadb-backup-server.sh
+    ${CMAKE_CURRENT_BINARY_DIR}/mariadb-backup-server COPYONLY)
+  INSTALL_SCRIPT(${CMAKE_CURRENT_BINARY_DIR}/mariadb-backup-server
+    DESTINATION ${INSTALL_BINDIR} COMPONENT Backup)
+
+  CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/scripts/mbstream-server.sh
+    ${CMAKE_CURRENT_BINARY_DIR}/mbstream-server COPYONLY)
+  INSTALL_SCRIPT(${CMAKE_CURRENT_BINARY_DIR}/mbstream-server
+    DESTINATION ${INSTALL_BINDIR} COMPONENT Backup)
+ENDIF()
diff --git a/extra/mariabackup/scripts/README.md b/extra/mariabackup/scripts/README.md
new file mode 100644
index 0000000000000..f9253022a36a0
--- /dev/null
+++ b/extra/mariabackup/scripts/README.md
@@ -0,0 +1,263 @@
+# mariadb-backup-server.sh — a BACKUP SERVER wrapper
+
+`mariadb-backup-server.sh` makes the server-side `BACKUP SERVER` command look
+like the old `mariadb-backup` tool. You call it with the familiar
+`--backup` / `--prepare` / `--copy-back` options; under the hood
+it just runs `BACKUP SERVER TO '<dir>'` over a normal `mariadb`
+connection and lets the server do the work. It's plain POSIX `sh`,
+so it runs anywhere `mariadb-backup` does.
+
+You need a server that supports `BACKUP SERVER`, the `mariadb` client on
+`PATH`, and an account allowed to run `BACKUP SERVER`. The parent of the
+target directory has to exist and be writable.
+
+## Installing / enabling it
+
+The wrapper is experimental and off by default. Build with
+`-DWITH_MARIABACKUP_WRAPPER=ON` and it installs next to the real
+binaries, under its own names so it never shadows them:
+
+```
+/usr/bin/mariadb-backup          # the C++ binary, unchanged
+/usr/bin/mariadb-backup-server   # this wrapper
+/usr/bin/mbstream                # the C++ binary, unchanged
+/usr/bin/mbstream-server         # the tar-based mbstream shim (for --stream)
+```
+
+To send your existing `mariadb-backup` (and `mbstream`) calls through the
+wrapper instead, point the names at them yourself — an alias, or a symlink
+earlier in `PATH`:
+
+```sh
+alias mariadb-backup=mariadb-backup-server
+alias mbstream=mbstream-server
+# or
+ln -s /usr/bin/mariadb-backup-server ~/bin/mariadb-backup
+ln -s /usr/bin/mbstream-server       ~/bin/mbstream
+```
+
+`mbstream-server` is only needed for `--stream` backups (it extracts the
+wrapper's tar stream).
+
+## Backing up
+
+```sh
+mariadb-backup-server --backup --target-dir=/backup/full
+```
+
+That runs `BACKUP SERVER TO '/backup/full'`. Use `--parallel=N` to ask for N
+concurrent streams (`... N CONCURRENT`; N=1 is the default and changes
+nothing).
+
+Connection options:
+`--user`, `--password`, `--host`, `--port`, `--socket`, `--defaults-file`,
+`--defaults-extra-file` and their short forms are passed straight to
+the `mariadb` client.
+
+`--throttle`, `--no-lock` and `--safe-slave-backup` are accepted and ignored;
+
+When the backup finishes the wrapper drops a `backup-prepare.cnf` into the
+target dir, next to the server's own `backup.cnf`. It records where `mariadbd`
+lives and the InnoDB layout, so `--prepare` can recover the backup later
+without you respelling all of that.
+
+### Streaming to stdout
+
+```sh
+mariadb-backup-server --backup --stream=tar > /backup/full.tar
+```
+
+`--stream` runs `BACKUP SERVER WITH [N CONCURRENT] '<command>'` instead of
+`... TO '<dir>'`. The server hands each stream's tar to `<command>`, the wrapper
+collects the parts and writes them to its stdout, so you can redirect to a file
+or pipe onwards.
+
+Two things follow from how `BACKUP SERVER` streams, and both differ from
+`mariadb-backup`:
+
+- **Local only.** The stream command runs *inside the server*, so its output
+lands on the server's filesystem. The wrapper can only pick it up when it runs
+on the same host (a shared filesystem), as the user the server writes as
+(typically `mysql`), or with a `--target-dir` the server can write. A remote
+`--host` cannot stream this way.
+
+- **tar only.** The server emits tar, never `xbstream`. Any `--stream=<format>`
+value (including `xbstream`) is accepted but the output is always tar.
+
+`--target-dir` is optional here; when given it is just the scratch directory for
+the per-stream parts (otherwise a `mktemp` dir is used).
+
+The output is the per-stream tar entries concatenated, with
+`backup-prepare.cnf` appended as the trailing archive.
+
+```sh
+mkdir restore && tar -xf /backup/full.tar -C restore
+```
+
+After extraction the directory holds the data files, the server's `backup.cnf`
+*and* the wrapper's `backup-prepare.cnf`, so it can be prepared exactly like a
+directory backup:
+
+```sh
+mariadb-backup-server --prepare --target-dir=restore
+```
+
+### `mbstream.sh` — the extraction shim
+
+The real `mbstream`/`xbstream` binary cannot read the wrapper's stream, because
+that stream is plain tar, not the `xbstream` format. So a companion shim,
+`mbstream.sh`, ships next to `mariadb-backup-server.sh` and maps the `mbstream` CLI onto
+`tar`, letting existing pipelines (and tests) that call `mbstream` keep working
+unchanged:
+
+```sh
+mbstream-server -x -C restore < /backup/full.tar     # tar -x -C restore
+mbstream-server -c -C dir file1 file2                # tar -c -C dir file1 file2
+```
+
+Notes:
+
+- **Extraction is a plain `tar -x`** — the stream has a single
+end-of-archive marker
+
+- **mbstream-only options are accepted and ignored** —
+`-p` / `--parallel`, compression flags, `-v` : So legacy
+invocations don't break.
+
+- It understands `-x` (extract, from stdin) and `-c` (create, to stdout),
+with `-C <dir>`; anything else is treated as a file operand or ignored.
+
+- It is a thin tar wrapper, so it only understands the wrapper's tar streams —
+do not point it at a real `xbstream` archive, and do not feed the wrapper's
+output to the real `mbstream`.
+
+## Preparing
+
+```sh
+mariadb-backup-server --prepare --target-dir=/backup/full
+```
+
+Prepare makes the backup bootable: it starts `mariadbd --bootstrap` on the
+target directory, replays the archived redo up to the backup's end LSN, then
+replaces the archived log with a fresh `ib_logfile0` so a normal server can
+start on it. Both `backup.cnf` and `backup-prepare.cnf` have to be there (they
+are, if this wrapper took the backup).
+
+Options:
+
+- `--use-memory=N` — buffer pool size during recovery.
+- `--innodb-*` and `--tmpdir` are forwarded to the bootstrap server.
+- `--defaults-file` / `--defaults-extra-file`, and encryption options such as
+  `--file-key-management*` / `--loose-file-key-management*` / `--plugin-load-add`,
+  are layered onto the bootstrap (as an extra defaults file / extra options) so
+  you can supply anything `backup-prepare.cnf` did not record.
+
+The `mariadbd` used for the bootstrap is the path recorded in
+`backup-prepare.cnf` at backup time if that binary exists; otherwise `mariadbd`
+from `PATH`. (Recorded-first matters: it is the same version that took the
+backup, so it can always parse the backed-up tablespace format.)
+
+## Restoring
+
+With the backup prepared and the server stopped, put it into the datadir:
+
+```sh
+mariadb-backup-server --copy-back --target-dir=/backup/full --datadir=/var/lib/mysql
+mariadb-backup-server --move-back --target-dir=/backup/full --datadir=/var/lib/mysql
+```
+
+`--copy-back` leaves the backup where it is; `--move-back` renames the files
+across, which is quicker on the same filesystem but consumes the backup. Either
+way the datadir is created if missing, and the wrapper won't write into a
+non-empty datadir unless you add `--force-non-empty-directories`.
+
+If the source server kept its Aria logs outside the datadir, pass the same
+`--aria-log-dir-path=<dir>` you use on the server. The wrapper creates that
+directory and moves the restored `aria_log_control` / `aria_log.*` files into
+it, so the server finds them on restart:
+
+```sh
+mariadb-backup-server --copy-back --target-dir=/backup/full --datadir=/var/lib/mysql \
+  --aria-log-dir-path=/var/lib/aria_logs
+```
+
+Neither fixes ownership, so finish up with:
+
+```sh
+chown -R mysql:mysql /var/lib/mysql
+systemctl start mariadb
+```
+
+## What it doesn't do
+
+These stop with an error instead of quietly producing an incomplete backup:
+
+- incremental backup/prepare: `--incremental-basedir`, `--incremental-dir`, `--apply-log-only`
+- partial backup: `--databases`, `--tables`, `--tables-file`. This needs server-side
+`backup_include`/`backup_exclude`, which don't exist yet
+- compression and encryption of the output: `--compress`, `--encrypt` (error out)
+- `--rollback-xa`: not supported (errors out)
+
+`--stream` is supported with the caveats above (local only, tar only, extract
+with a plain `tar -x`);
+
+`--export` is accepted but not implemented: it warns and does a plain recovery
+(no per-table `.cfg` files for IMPORT TABLESPACE).
+
+## Environment overrides
+
+The wrapped commands can be overridden via environment variables,
+mainly for testing:
+
+- `MARIADB`: the client used to talk to the server (default `mariadb`),
+e.g. `MARIADB='mariadb --protocol=tcp'`.
+
+- `MARIADBD`: the server binary the `--prepare` bootstrap runs (by default the
+path recorded in `backup-prepare.cnf`, else `mariadbd` on `PATH`). When set it
+overrides that resolution. To run it under `rr`, put `rr` in `MARIADBD` and let
+`rr`'s own `_RR_TRACE_DIR` choose where the trace goes, e.g.
+`_RR_TRACE_DIR=/dev/shm/rr MARIADBD='rr record mariadbd' ...`.
+
+- `TAR`: the tar implementation (default `tar`),
+e.g. `TAR=bsdtar` (libarchive-tools).
+Used by `--stream` and by `mbstream-server`.
+
+## The two .cnf files
+
+`backup.cnf` is written by the server and tells `--prepare` what parts of redo to replay:
+
+```ini
+[server]
+# checkpoint=54088
+innodb_log_recovery_start=54088     # recovery starts scanning here
+innodb_log_recovery_target=56337    # the backup's end LSN; recovery stops here
+```
+
+`backup-prepare.cnf` is written by the wrapper and handed to the prepare
+bootstrap as its defaults file:
+
+```ini
+# mariadbd=/usr/sbin/mariadbd
+[mariadbd]
+innodb_page_size=16384
+innodb_data_file_path=ibdata1:12M:autoextend
+innodb_undo_tablespaces=3
+innodb_checksum_algorithm=full_crc32
+innodb_log_file_size=100663296
+```
+
+If the server is encrypted it also records how to load the key-management
+plugin again, so an encrypted backup can be prepared without extra input.
+For `file_key_management` it captures every plugin variable (the same way
+`mariadb-backup` writes them into `backup-my.cnf`) 
+
+```ini
+plugin-load-add=file_key_management
+innodb_encrypt_log=ON
+loose-file-key-management
+loose-file_key_management_filename=/etc/mysql/keys.enc
+loose-file_key_management_filekey=FILE:/etc/mysql/keyfile.key
+loose-file_key_management_encryption_algorithm=aes_cbc
+loose-file_key_management_digest=sha1
+loose-file_key_management_use_pbkdf2=1
+```
diff --git a/extra/mariabackup/scripts/mariadb-backup-server.sh b/extra/mariabackup/scripts/mariadb-backup-server.sh
new file mode 100755
index 0000000000000..57a64109b4159
--- /dev/null
+++ b/extra/mariabackup/scripts/mariadb-backup-server.sh
@@ -0,0 +1,366 @@
+#!/bin/sh
+me=${0##*/}
+die() {
+    echo "$me: $*" >&2
+    exit 1
+}
+
+# The wrapped commands can be overridden for testing, e.g.
+#   MARIADB='mariadb --protocol=tcp', TAR=bsdtar.
+
+# To run the prepare bootstrap under rr, include it in MARIADBD
+# (rr's own _RR_TRACE_DIR controls where the trace is written).
+# e.g.  _RR_TRACE_DIR=/dev/shm/rr MARIADBD='rr record mariadbd' ...
+: "${MARIADB:=mariadb}"
+: "${TAR:=tar}"
+
+MODE=
+TARGET_DIR=
+DATADIR=
+PARALLEL=
+USE_MEMORY=
+FORCE_NON_EMPTY=
+EXPORT=
+ROLLBACK_XA=
+MARIADB_OPTS=
+INNODB_OPTS=
+MYSQLD_EXTRA=
+PREPARE_DEFAULTS=
+ARIA_LOG_DIR=
+STREAM=
+
+while [ $# -gt 0 ]; do
+    case $1 in
+    --backup)              MODE=backup ;;
+    --prepare|--apply-log) MODE=prepare ;;
+    --copy-back)           MODE=copy-back ;;
+    --move-back)           MODE=move-back ;;
+
+    --target-dir=*) TARGET_DIR=${1#*=} ;;
+    --datadir=*)    DATADIR=${1#*=} ;;
+    --aria-log-dir-path=*) ARIA_LOG_DIR=${1#*=} ;;
+    --use-memory=*) USE_MEMORY=${1#*=} ;;
+    --parallel=*)   PARALLEL=${1#*=} ;;
+
+    --export)                      EXPORT=1 ;;
+    --rollback-xa)                 ROLLBACK_XA=1 ;;
+    --force-non-empty-directories) FORCE_NON_EMPTY=1 ;;
+
+    --innodb|--innodb=*|--innodb-*|--innodb_*|--skip-innodb-*|--skip_innodb_*)
+	INNODB_OPTS="$INNODB_OPTS $1" ;;
+    --tmpdir=*) MYSQLD_EXTRA="$MYSQLD_EXTRA $1" ;;
+    -t)  MYSQLD_EXTRA="$MYSQLD_EXTRA --tmpdir=$2"; shift ;;
+    -t*) MYSQLD_EXTRA="$MYSQLD_EXTRA --tmpdir=${1#-t}" ;;
+    --incremental-basedir=*|--incremental-dir=*)
+        die "incremental backup/prepare is not supported" ;;
+    --apply-log-only)
+        die "--apply-log-only is not supported" ;;
+    --databases=*|--databases-exclude=*|--tables=*|--tables-exclude=*|--tables-file=*)
+        die "partial backup needs server-side backup_include/backup_exclude, which doesn't exist yet" ;;
+    # BACKUP SERVER only ever produces tar
+    --stream|--stream=*)                          STREAM=1 ;;
+    --compress|--compress=*|--compress-threads=*) die "--compress is not supported" ;;
+    --encrypt|--encrypt=*)                        die "--encrypt is not supported" ;;
+    --innobackupex) die "innobackupex mode is not supported" ;;
+
+    # Defaults files feed the backup client
+    --defaults-file=*|--defaults-extra-file=*)
+        MARIADB_OPTS="$MARIADB_OPTS $1"
+        PREPARE_DEFAULTS="$PREPARE_DEFAULTS --defaults-extra-file=${1#*=}" ;;
+    # Encryption options are forwarded to the prepare bootstrap.
+    --file-key-management*|--plugin-load-add=*|--loose-file-key-management*|\
+    --aria-encrypt-tables*|--encrypt-tmp-disk-tables*)
+        PREPARE_DEFAULTS="$PREPARE_DEFAULTS $1" ;;
+
+    --user=*|--password=*|--host=*|--port=*|--socket=*|\
+    --defaults-group=*|\
+    --secure-auth|--skip-secure-auth|--ssl|--ssl-verify-server-cert|\
+    --ssl-ca=*|--ssl-capath=*|--ssl-cert=*|--ssl-cipher=*|\
+    --ssl-crl=*|--ssl-crlpath=*|--ssl-key=*|--tls-version=*)
+        MARIADB_OPTS="$MARIADB_OPTS $1" ;;
+    -p)
+        if [ -n "${2-}" ] && case $2 in -*) false ;; *) true ;; esac; then
+            MARIADB_OPTS="$MARIADB_OPTS -p$2"; shift
+        else
+            MARIADB_OPTS="$MARIADB_OPTS -p"
+        fi ;;
+    -u|-P|-S) MARIADB_OPTS="$MARIADB_OPTS $1 $2"; shift ;;
+    -H)       MARIADB_OPTS="$MARIADB_OPTS --host=$2"; shift ;;
+    -p*|-u*|-P*|-S*) MARIADB_OPTS="$MARIADB_OPTS $1" ;;
+    -H*)      MARIADB_OPTS="$MARIADB_OPTS --host=${1#-H}" ;;
+
+    -h)  DATADIR=$2; shift ;;
+    -h*) DATADIR=${1#-h} ;;
+
+    # Everything else is accepted and ignored:
+    *) ;;
+    esac
+    shift
+done
+
+# In stream mode --target-dir is optional:
+# it is only a scratch directory for the per-stream tar parts
+# (a mktemp dir is used when it is omitted).
+[ -n "$STREAM" ] || [ -n "$TARGET_DIR" ] || die "--target-dir required"
+
+# Run the client with the connection options we collected.
+ask() { $MARIADB $MARIADB_OPTS -BN -e "$1" 2>/dev/null; }
+
+# Print the backup-prepare.cnf contents to stdout.
+# It captures everything --prepare's offline bootstrap needs:
+# where mariadbd lives, the InnoDB parameters, and how to
+# reload the encryption key plugin. Used both for a
+# directory backup (written into the target dir)
+# and a streamed backup (appended to the stream so it lands
+# in the extracted directory).
+
+write_prepare_cnf() {
+    _mariadbd=
+    _pidfile=$(ask "SELECT @@global.pid_file")
+    if [ -n "$_pidfile" ] && [ -r "$_pidfile" ]; then
+        _pid=$(cat "$_pidfile" 2>/dev/null)
+        [ -n "$_pid" ] && _mariadbd=$(readlink -f "/proc/$_pid/exe" 2>/dev/null)
+    fi
+    if [ -z "$_mariadbd" ]; then
+        _basedir=$(ask "SELECT @@global.basedir")
+        for _c in "$_basedir/sbin/mariadbd" "$_basedir/bin/mariadbd" \
+                  "$_basedir/sbin/mysqld"   "$_basedir/bin/mysqld"; do
+            [ -x "$_c" ] && { _mariadbd=$_c; break; }
+        done
+    fi
+
+    _page_size=$(ask      "SELECT @@global.innodb_page_size")
+    _data_file_path=$(ask "SELECT @@global.innodb_data_file_path")
+    _undo_ts=$(ask        "SELECT @@global.innodb_undo_tablespaces")
+    _checksum=$(ask       "SELECT @@global.innodb_checksum_algorithm")
+    _log_file_size=$(ask  "SELECT @@global.innodb_log_file_size")
+
+    _enc=$(ask "SELECT LOWER(plugin_name) FROM information_schema.PLUGINS
+               WHERE plugin_type='ENCRYPTION' AND plugin_status='ACTIVE' LIMIT 1")
+
+    [ -n "$_mariadbd" ] && echo "# mariadbd=$_mariadbd"
+    echo "[mariadbd]"
+    [ -n "$_page_size" ]      && echo "innodb_page_size=$_page_size"
+    [ -n "$_data_file_path" ] && echo "innodb_data_file_path=$_data_file_path"
+    [ -n "$_undo_ts" ]        && echo "innodb_undo_tablespaces=$_undo_ts"
+    [ -n "$_checksum" ]       && echo "innodb_checksum_algorithm=$_checksum"
+    [ -n "$_log_file_size" ]  && echo "innodb_log_file_size=$_log_file_size"
+
+    if [ -n "$_enc" ]; then
+        echo "plugin-load-add=$_enc"
+	_plugin_dir=$(ask "SELECT @@global.plugin_dir")
+	[ -n "$_plugin_dir" ] && echo "plugin-dir=$_plugin_dir"
+        case $(ask "SELECT @@global.innodb_encrypt_log") in
+            1|ON) echo "innodb_encrypt_log=ON" ;;
+        esac
+        if [ "$_enc" = file_key_management ]; then
+            echo "loose-file-key-management"
+            ask "SHOW VARIABLES LIKE 'file_key_management%'" |
+            while read -r _fkm_name _fkm_value; do
+               [ -n "$_fkm_name" ] && echo "loose-$_fkm_name=$_fkm_value"
+            done
+        fi
+    fi
+}
+
+
+# prepare
+if [ "$MODE" = prepare ]; then
+    [ -z "$ROLLBACK_XA" ]          || die "--rollback-xa is not supported"
+    [ -d "$TARGET_DIR" ]           || die "no such directory: $TARGET_DIR"
+    [ -f "$TARGET_DIR/backup.cnf" ] || die "backup.cnf not found in $TARGET_DIR"
+
+    cnf=$TARGET_DIR/backup-prepare.cnf
+    [ -f "$cnf" ] || die "$cnf missing - was this backup made by the wrapper?"
+    [ -z "$EXPORT" ] || echo "$me: --export not implemented, doing a plain recovery" >&2
+
+    # Prefer the binary recorded at backup time
+    # else, fall back to mariadbd on PATH only if the
+    # recorded one is missing.
+    # MARIADBD overrides the recorded/PATH binary
+    if [ -n "${MARIADBD-}" ]; then
+        mariadbd=$MARIADBD
+    else
+        mariadbd=$(sed -n 's/^# *mariadbd=//p' "$cnf" | tail -n1)
+        [ -n "$mariadbd" ] && [ -x "$mariadbd" ] || mariadbd=mariadbd
+    fi
+
+    # backup.cnf tells us the LSN window recovery should replay.
+    start=$(grep  '^innodb_log_recovery_start'  "$TARGET_DIR/backup.cnf" | cut -d= -f2 | tr -d ' ')
+    target=$(grep '^innodb_log_recovery_target' "$TARGET_DIR/backup.cnf" | cut -d= -f2 | tr -d ' ')
+
+    opts="--datadir=$TARGET_DIR --innodb=FORCE"
+    [ -n "$start" ]      && opts="$opts --innodb-log-recovery-start=$start"
+    [ -n "$target" ]     && opts="$opts --innodb-log-recovery-target=$target"
+    [ -n "$USE_MEMORY" ] && opts="$opts --innodb-buffer-pool-size=$USE_MEMORY"
+    opts="$opts$INNODB_OPTS$MYSQLD_EXTRA"
+
+    # Recovery stops at the backup's end LSN but leaves the
+    # archived log (ib_<lsn>.log) behind, which a normal server
+    # won't boot from. After recovery we build a fresh ib_logfile0
+    # (header + a checkpoint at the end LSN) and put it in place
+    # of the archived log.
+    input=/dev/null
+    newlog=$TARGET_DIR/ib_logfile0.new
+    if [ -n "$target" ]; then
+        lsn=$(printf '%016x' "$target")
+        rm -f "$newlog"
+        input=$(mktemp)
+        cat > "$input" <<EOF
+set @lsn=x'$lsn';
+set @header=concat('Phys',x'00000000',@lsn,repeat(x'00',492));
+set @header=concat(@header,unhex(lpad(hex(crc32c(@header)),8,'0')),repeat(x'00',3584));
+set @checkpoint=concat(@lsn,@lsn,repeat(x'00',44));
+set @checkpoint=concat(@checkpoint,unhex(lpad(hex(crc32c(@checkpoint)),8,'0')),repeat(x'00',8128));
+set @payload=concat(x'fa0000',@lsn);
+set @payload=concat(@payload,x'01',unhex(lpad(hex(crc32c(@payload)),8,'0')));
+select concat(@header,@checkpoint,@payload) into dumpfile '$newlog';
+EOF
+    fi
+
+    $mariadbd --defaults-file="$cnf" $PREPARE_DEFAULTS $opts --bootstrap < "$input"
+    rc=$?
+    [ "$input" = /dev/null ] || rm -f "$input"
+    [ $rc -eq 0 ] || die "recovery failed (mariadbd exited $rc)"
+
+    if [ -n "$target" ]; then
+        [ -f "$newlog" ] || die "could not build ib_logfile0 for LSN $target"
+        rm -f "$TARGET_DIR"/ib_*.log
+        mv "$newlog" "$TARGET_DIR/ib_logfile0"
+    fi
+
+    echo "Prepare completed: $TARGET_DIR" >&2
+    exit 0
+fi
+
+
+# copy-back / move-back
+if [ "$MODE" = copy-back ] || [ "$MODE" = move-back ]; then
+    [ -d "$TARGET_DIR" ]            || die "no such directory: $TARGET_DIR"
+    [ -f "$TARGET_DIR/backup.cnf" ] || die "backup.cnf not found in $TARGET_DIR"
+    [ -n "$DATADIR" ]              || die "--datadir required for --$MODE"
+
+    # mariadb-backup creates the datadir if it's missing; do the same.
+    [ -d "$DATADIR" ] || mkdir -p "$DATADIR" || die "cannot create datadir: $DATADIR"
+
+    # Refuse a non-empty datadir (dotfiles included) unless told otherwise.
+    if [ -z "$FORCE_NON_EMPTY" ]; then
+        for f in "$DATADIR"/* "$DATADIR"/.[!.]* "$DATADIR"/..?*; do
+            { [ -e "$f" ] || [ -L "$f" ]; } &&
+                die "datadir not empty: $DATADIR (pass --force-non-empty-directories)"
+        done
+    fi
+
+    if [ "$MODE" = copy-back ]; then
+        echo "$me: copying $TARGET_DIR -> $DATADIR" >&2
+        cp -R "$TARGET_DIR"/. "$DATADIR"/ || die "copy-back failed"
+    else
+        echo "$me: moving $TARGET_DIR -> $DATADIR" >&2
+        for f in "$TARGET_DIR"/* "$TARGET_DIR"/.[!.]* "$TARGET_DIR"/..?*; do
+            { [ -e "$f" ] || [ -L "$f" ]; } || continue
+            mv "$f" "$DATADIR"/ || die "move-back failed"
+        done
+    fi
+
+    # Aria logs live in --aria-log-dir-path when set; 
+    # backup placed them at the datadir root,
+    # so relocate them there and create the directory the server
+    # expects on restart.
+    if [ -n "$ARIA_LOG_DIR" ] && [ "$ARIA_LOG_DIR" != "$DATADIR" ]; then
+        mkdir -p "$ARIA_LOG_DIR" || die "cannot create aria-log-dir-path: $ARIA_LOG_DIR"
+        for f in "$DATADIR"/aria_log_control "$DATADIR"/aria_log.*; do
+            [ -e "$f" ] && { mv "$f" "$ARIA_LOG_DIR"/ || die "aria log relocate failed"; }
+        done
+    fi
+
+    echo "Restore completed: $DATADIR" >&2
+    echo "$me: now run: chown -R mysql:mysql $DATADIR && start the server" >&2
+    exit 0
+fi
+
+
+# backup (streaming)
+# "BACKUP SERVER WITH [N CONCURRENT] '<command>'" runs <command>
+# inside the server feeding that stream's tar to the command's stdin.
+if [ -n "$STREAM" ]; then
+    if [ -n "$TARGET_DIR" ]; then
+        scratch=$TARGET_DIR
+        mkdir -p "$scratch" || die "cannot create scratch dir: $scratch"
+        keep_scratch=1
+    else
+        scratch=$(mktemp -d "${TMPDIR:-/tmp}/mariabackup-stream.XXXXXX") \
+            || die "cannot create scratch directory"
+        keep_scratch=
+    fi
+
+    cleanup_stream() {
+        rm -f "$scratch"/.mariabackup-stream.sh "$scratch"/*.tar \
+              "$scratch"/backup-prepare.cnf
+        [ -n "$keep_scratch" ] || rmdir "$scratch" 2>/dev/null
+    }
+
+    # The server appends the stream index as $1 and writes that stream's tar
+    # to our stdin; we drop each one into the scratch dir under <index>.tar.
+    helper=$scratch/.mariabackup-stream.sh
+    cat > "$helper" <<EOF
+#!/bin/sh
+exec cat > "$scratch/\$1.tar"
+EOF
+
+    # Invoke via "/bin/sh <helper>" so the script needs no execute bit
+    # (scratch may sit on a noexec filesystem such as /dev/shm).
+    sql="BACKUP SERVER WITH"
+    case $PARALLEL in           # --parallel=N -> "N CONCURRENT" (1 is default)
+        ''|*[!0-9]*) ;;
+        *) [ "$PARALLEL" -gt 1 ] && sql="$sql $PARALLEL CONCURRENT" ;;
+    esac
+    sql="$sql '/bin/sh $helper'"
+
+    # Keep stdout clean for the tar: send any client output to stderr.
+    $MARIADB $MARIADB_OPTS -e "$sql" >&2 \
+        || { cleanup_stream; die "BACKUP SERVER failed"; }
+
+    # Concatenate the per-stream tars to stdout in index order,
+    # then append backup-prepare.cnf as one more tar archive
+    # so it lands in the extracted directory alongside the
+    # server's backup.cnf. The per-stream tars carry no
+    # end-of-archive marker; only this trailing
+    # backup-prepare.cnf adds the single end marker,
+    # so the whole stream extracts with a plain "tar -x".
+    n=1
+    while [ -f "$scratch/$n.tar" ]; do
+        cat "$scratch/$n.tar" || { cleanup_stream; die "streaming to stdout failed"; }
+        n=$((n + 1))
+    done
+
+    echo "$me: appending backup-prepare.cnf to the stream" >&2
+    write_prepare_cnf > "$scratch/backup-prepare.cnf" \
+        || { cleanup_stream; die "could not build backup-prepare.cnf"; }
+    $TAR -C "$scratch" -cf - backup-prepare.cnf \
+        || { cleanup_stream; die "could not append backup-prepare.cnf to the stream"; }
+
+    cleanup_stream
+    echo "$me: streamed $((n - 1)) tar stream(s) plus backup-prepare.cnf to stdout" >&2
+    exit 0
+fi
+
+
+# --- backup (directory) -----------------------------------------------------
+parent=$(dirname "$TARGET_DIR")
+[ -d "$parent" ] || die "parent directory does not exist: $parent"
+[ -w "$parent" ] || die "parent directory is not writable: $parent"
+
+sql="BACKUP SERVER TO '$TARGET_DIR'"
+case $PARALLEL in           # --parallel=N -> "N CONCURRENT" (1 is the default)
+    ''|*[!0-9]*) ;;
+    *) [ "$PARALLEL" -gt 1 ] && sql="$sql $PARALLEL CONCURRENT" ;;
+esac
+$MARIADB $MARIADB_OPTS -e "$sql" || die "BACKUP SERVER failed"
+
+# Create backup-prepare.cnf with everything --prepare's offline
+# bootstrap needs: where mariadbd is, the InnoDB parameters,
+# and how to load the key plugin again.
+[ -f "$TARGET_DIR/backup.cnf" ] || exit 0
+
+echo "$me: writing backup-prepare.cnf" >&2
+write_prepare_cnf > "$TARGET_DIR/backup-prepare.cnf"
diff --git a/extra/mariabackup/scripts/mbstream-server.sh b/extra/mariabackup/scripts/mbstream-server.sh
new file mode 100755
index 0000000000000..7ba2bbabe7e6d
--- /dev/null
+++ b/extra/mariabackup/scripts/mbstream-server.sh
@@ -0,0 +1,64 @@
+#!/bin/sh
+# mbstream-compatible for the BACKUP SERVER wrapper.
+#
+# This maps the mbstream CLI to `tar`:
+#
+#   mbstream -x -C <dir>      < archive      ->  tar -x -C <dir>
+#   mbstream -c <paths...>    > archive      ->  tar -c <paths...>
+#
+# mbstream-only options are accepted and ignored so
+# existing invocations keep working unchanged.
+me=${0##*/}
+die() {
+    echo "$me: $*" >&2
+    exit 1
+}
+
+# The tar implementation can be overridden for testing.
+# e.g. TAR=bsdtar.
+: "${TAR:=tar}"
+
+mode=
+dir=.
+files=
+
+while [ $# -gt 0 ]; do
+    case $1 in
+    -x|--extract)            mode=x ;;
+    -c|--create)             mode=c ;;
+    -C|--directory)          dir=$2; shift ;;
+    -C*)                     dir=${1#-C} ;;
+    --directory=*)           dir=${1#*=} ;;
+
+    # mbstream-only flags that have no tar equivalent: drop them.
+    -p|--parallel)           shift ;;
+    -p*|--parallel=*)        ;;
+    --decompress|--compress) ;;
+    -v|--verbose)            ;;
+
+    --)                      shift; break ;;
+    # Reject anything we do not recognise rather than
+    # silently ignoring it (e.g. GNU tar's -b takes an argument
+    # that would otherwise be mistaken for a file operand).
+    # This is an mbstream-on-tar shim, not tar.
+    -*)                      die "unsupported option: $1" ;;
+    *)                       files="$files $1" ;;
+    esac
+    shift
+done
+
+while [ $# -gt 0 ]; do
+    files="$files $1"
+    shift
+done
+
+case $mode in
+    # The wrapper concatenates the per-stream tar entries
+    # with no end-of-archive marker between them; only the
+    # trailing backup-prepare.cnf adds the single end marker.
+    x) exec $TAR -x -f - -C "$dir" ;;
+    c)
+        [ -n "$files" ] || files=.
+        exec $TAR -c -f - -C "$dir" $files ;;
+    *) die "expected -x (extract) or -c (create)" ;;
+esac
diff --git a/libmysqld/CMakeLists.txt b/libmysqld/CMakeLists.txt
index 80b202aa4c03e..59f386a86edae 100644
--- a/libmysqld/CMakeLists.txt
+++ b/libmysqld/CMakeLists.txt
@@ -166,6 +166,7 @@ SET(SQL_EMBEDDED_SOURCES emb_qcache.cc libmysqld.c lib_sql.cc
            ../sql/opt_hints.cc ../sql/opt_hints.h
 	   ../sql/opt_trace_ddl_info.cc ../sql/opt_trace_ddl_info.h
            ../sql/sql_path.cc
+           ../sql/sql_backup.cc
            ${GEN_SOURCES}
            ${MYSYS_LIBWRAP_SOURCE}
 )
diff --git a/mysql-test/collections/buildbot_suites.bat b/mysql-test/collections/buildbot_suites.bat
index 053057872bf40..129a2f67d79de 100644
--- a/mysql-test/collections/buildbot_suites.bat
+++ b/mysql-test/collections/buildbot_suites.bat
@@ -6,6 +6,7 @@ innodb,^
 versioning,^
 plugins,^
 mariabackup,^
+backup,^
 roles,^
 auth_gssapi,^
 mysql_sha2,^
diff --git a/mysql-test/include/have_mariabackup_combination.combinations b/mysql-test/include/have_mariabackup_combination.combinations
new file mode 100644
index 0000000000000..12bc42487d520
--- /dev/null
+++ b/mysql-test/include/have_mariabackup_combination.combinations
@@ -0,0 +1,3 @@
+[CLIENT]
+
+[SERVER]
diff --git a/mysql-test/include/have_mariabackup_combination.inc b/mysql-test/include/have_mariabackup_combination.inc
new file mode 100644
index 0000000000000..a2b79d6310efc
--- /dev/null
+++ b/mysql-test/include/have_mariabackup_combination.inc
@@ -0,0 +1,5 @@
+if ($MTR_COMBINATION_SERVER)
+{
+  --source include/have_mariabackup_wrapper.inc
+}
+
diff --git a/mysql-test/include/have_mariabackup_wrapper.inc b/mysql-test/include/have_mariabackup_wrapper.inc
new file mode 100644
index 0000000000000..d9d8ee82e74ee
--- /dev/null
+++ b/mysql-test/include/have_mariabackup_wrapper.inc
@@ -0,0 +1,38 @@
+# Redirect `$XTRABACKUP` so existing test invocations like
+#
+#     --exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf \
+#         --backup --target-dir=$targetdir
+#
+# run through extra/mariabackup/scripts/mariadb-backup-server.sh — the BACKUP
+# SERVER compatibility wrapper — without any change to the test body.
+#
+#   --source include/have_mariabackup_wrapper.inc
+#   # ... rest of the test, using $XTRABACKUP as usual ...
+#
+#   $XTRABACKUP : now points at mariadb-backup-server.sh
+
+--source include/not_windows.inc
+
+--let MARIABACKUP_WRAPPER=$MYSQL_TEST_DIR/../extra/mariabackup/scripts/mariadb-backup-server.sh
+--let MBSTREAM_WRAPPER=$MYSQL_TEST_DIR/../extra/mariabackup/scripts/mbstream-server.sh
+
+# The wrapper shells out to the bare `mariadb` client, which mtr does not put
+# on PATH. Prepend the build's client directories so it resolves. A `let` with
+# no leading $ is exported to the environment of later --exec commands.
+--let PATH=$MYSQL_BINDIR/client:$MYSQL_BINDIR/client_release:$MYSQL_BINDIR/client_debug:$MYSQL_BINDIR/bin:$PATH
+
+--error 0,1
+perl;
+my $w = $ENV{MARIABACKUP_WRAPPER};
+my $m = $ENV{MBSTREAM_WRAPPER};
+exit 1 unless $w && -x $w && $m && -x $m;
+exit 0;
+EOF
+
+if ($errno)
+{
+  --skip mariadb-backup-server.sh wrapper unavailable (script or sh missing)
+}
+
+--let XTRABACKUP=$MARIABACKUP_WRAPPER
+--let XBSTREAM=$MBSTREAM_WRAPPER
diff --git a/mysql-test/main/backup_server.result b/mysql-test/main/backup_server.result
new file mode 100644
index 0000000000000..7a064d7e5fe11
--- /dev/null
+++ b/mysql-test/main/backup_server.result
@@ -0,0 +1,6 @@
+BACKUP SERVER TO '$datadir/some_directory';
+ERROR HY000: Incorrect arguments to BACKUP SERVER TO
+BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+ERROR HY000: Can't create directory 'MYSQLTEST_VARDIR/some_directory' (Errcode: 17 "File exists")
+BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
diff --git a/mysql-test/main/backup_server.test b/mysql-test/main/backup_server.test
new file mode 100644
index 0000000000000..50cf326d39838
--- /dev/null
+++ b/mysql-test/main/backup_server.test
@@ -0,0 +1,10 @@
+--let $datadir=`select @@datadir`
+--error ER_WRONG_ARGUMENTS
+evalp BACKUP SERVER TO '$datadir/some_directory';
+evalp BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+--error 21
+evalp BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+--rmdir $MYSQLTEST_VARDIR/some_directory
+evalp BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+--rmdir $MYSQLTEST_VARDIR/some_directory
diff --git a/mysql-test/main/backup_server_locking.result b/mysql-test/main/backup_server_locking.result
new file mode 100644
index 0000000000000..6e49a09e3e873
--- /dev/null
+++ b/mysql-test/main/backup_server_locking.result
@@ -0,0 +1,17 @@
+BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+ERROR HY000: Can't create directory 'MYSQLTEST_VARDIR/some_directory' (Errcode: 17 "File exists")
+BACKUP STAGE START;
+connect  backup,localhost,root;
+SET STATEMENT max_statement_time=0.1 FOR
+BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+ERROR 70100: Query was interrupted: execution time limit 0.1 sec exceeded
+connection default;
+BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+ERROR HY000: Can't execute the command as you have a BACKUP STAGE active
+BACKUP STAGE END;
+connection backup;
+SET STATEMENT max_statement_time=0.1 FOR
+BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+ERROR HY000: Can't create directory 'MYSQLTEST_VARDIR/some_directory' (Errcode: 17 "File exists")
+disconnect backup;
+connection default;
diff --git a/mysql-test/main/backup_server_locking.test b/mysql-test/main/backup_server_locking.test
new file mode 100644
index 0000000000000..4e769b61b2f20
--- /dev/null
+++ b/mysql-test/main/backup_server_locking.test
@@ -0,0 +1,31 @@
+--source include/not_embedded.inc
+--source include/count_sessions.inc
+
+--mkdir $MYSQLTEST_VARDIR/some_directory
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+--error 21
+evalp BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+
+BACKUP STAGE START;
+--connect (backup,localhost,root)
+--error ER_STATEMENT_TIMEOUT
+evalp SET STATEMENT max_statement_time=0.1 FOR
+BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+
+--connection default
+
+--error ER_BACKUP_LOCK_IS_ACTIVE
+evalp BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+
+BACKUP STAGE END;
+--connection backup
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+--error 21
+evalp SET STATEMENT max_statement_time=0.1 FOR
+BACKUP SERVER TO '$MYSQLTEST_VARDIR/some_directory';
+--disconnect backup
+--connection default
+
+--rmdir $MYSQLTEST_VARDIR/some_directory
+
+--source include/wait_until_count_sessions.inc
diff --git a/mysql-test/main/grant_backup_server.result b/mysql-test/main/grant_backup_server.result
new file mode 100644
index 0000000000000..a4d85292dee45
--- /dev/null
+++ b/mysql-test/main/grant_backup_server.result
@@ -0,0 +1,27 @@
+CREATE USER user1@localhost IDENTIFIED BY '';
+connect con1,localhost,user1;
+BACKUP SERVER TO 'some_directory';
+ERROR 42000: Access denied; you need (at least one of) the RELOAD privilege(s) for this operation
+disconnect con1;
+connection default;
+GRANT SELECT ON test.* TO user1@localhost;
+connect con1,localhost,user1;
+BACKUP SERVER TO 'some_directory';
+ERROR 42000: Access denied; you need (at least one of) the RELOAD privilege(s) for this operation
+disconnect con1;
+connection default;
+GRANT RELOAD ON test.* TO user1@localhost;
+ERROR HY000: Incorrect usage of DB GRANT and GLOBAL PRIVILEGES
+GRANT RELOAD ON *.* TO user1@localhost;
+connect con1,localhost,user1;
+BACKUP SERVER TO 'some_directory';
+ERROR 42000: Access denied; you need (at least one of) the SELECT privilege(s) for this operation
+disconnect con1;
+connection default;
+GRANT SELECT ON *.* TO user1@localhost;
+connect con1,localhost,user1;
+BACKUP SERVER TO '$datadir/some_directory';
+ERROR HY000: Incorrect arguments to BACKUP SERVER TO
+disconnect con1;
+connection default;
+DROP USER user1@localhost;
diff --git a/mysql-test/main/grant_backup_server.test b/mysql-test/main/grant_backup_server.test
new file mode 100644
index 0000000000000..726abb19908bb
--- /dev/null
+++ b/mysql-test/main/grant_backup_server.test
@@ -0,0 +1,29 @@
+--source include/not_embedded.inc
+CREATE USER user1@localhost IDENTIFIED BY '';
+--connect con1,localhost,user1
+--error ER_SPECIFIC_ACCESS_DENIED_ERROR
+BACKUP SERVER TO 'some_directory';
+--disconnect con1
+--connection default
+GRANT SELECT ON test.* TO user1@localhost;
+--connect con1,localhost,user1
+--error ER_SPECIFIC_ACCESS_DENIED_ERROR
+BACKUP SERVER TO 'some_directory';
+--disconnect con1
+--connection default
+--error ER_WRONG_USAGE
+GRANT RELOAD ON test.* TO user1@localhost;
+GRANT RELOAD ON *.* TO user1@localhost;
+--connect con1,localhost,user1
+--error ER_SPECIFIC_ACCESS_DENIED_ERROR
+BACKUP SERVER TO 'some_directory';
+--disconnect con1
+--connection default
+GRANT SELECT ON *.* TO user1@localhost;
+--connect con1,localhost,user1
+--let $datadir=`select @@datadir`
+--error ER_WRONG_ARGUMENTS
+evalp BACKUP SERVER TO '$datadir/some_directory';
+--disconnect con1
+--connection default
+DROP USER user1@localhost;
diff --git a/mysql-test/main/mysqld--help.result b/mysql-test/main/mysqld--help.result
index 623311c170616..e55576862a7c2 100644
--- a/mysql-test/main/mysqld--help.result
+++ b/mysql-test/main/mysqld--help.result
@@ -2040,7 +2040,7 @@ performance-schema-max-socket-classes 10
 performance-schema-max-socket-instances -1
 performance-schema-max-sql-text-length 1024
 performance-schema-max-stage-classes 170
-performance-schema-max-statement-classes 227
+performance-schema-max-statement-classes 228
 performance-schema-max-statement-stack 10
 performance-schema-max-table-handles -1
 performance-schema-max-table-instances -1
diff --git a/mysql-test/mariadb-test-run.pl b/mysql-test/mariadb-test-run.pl
index 788927069015e..936e3c4d8fdf6 100755
--- a/mysql-test/mariadb-test-run.pl
+++ b/mysql-test/mariadb-test-run.pl
@@ -180,6 +180,7 @@ END
     main-
     archive-
     atomic-
+    backup-
     binlog-
     binlog_encryption-
     binlog_in_engine-
diff --git a/mysql-test/suite/backup/backup_innodb,debug.rdiff b/mysql-test/suite/backup/backup_innodb,debug.rdiff
new file mode 100644
index 0000000000000..592e1bf5e57ad
--- /dev/null
+++ b/mysql-test/suite/backup/backup_innodb,debug.rdiff
@@ -0,0 +1,16 @@
+--- backup_innodb.result
++++ backup_innodb,debug.result
+@@ -20,7 +20,13 @@
+ BEGIN;
+ DELETE FROM t;
+ connect backup,localhost,root;
++SET DEBUG_SYNC='innodb_backup_start SIGNAL start WAIT_FOR resume';
+ BACKUP SERVER TO 'target_directory' 4 CONCURRENT;
++connection default;
++SET DEBUG_SYNC='now WAIT_FOR start';
++INSERT INTO t(a) SELECT * FROM seq_1_to_30000;
++SET DEBUG_SYNC='now SIGNAL resume';
++connection backup;
+ disconnect backup;
+ connection default;
+ ROLLBACK;
diff --git a/mysql-test/suite/backup/backup_innodb.combinations b/mysql-test/suite/backup/backup_innodb.combinations
new file mode 100644
index 0000000000000..7fd419bba7692
--- /dev/null
+++ b/mysql-test/suite/backup/backup_innodb.combinations
@@ -0,0 +1,4 @@
+[archived]
+innodb_log_archive=ON
+[circular]
+innodb_log_archive=OFF
diff --git a/mysql-test/suite/backup/backup_innodb.result b/mysql-test/suite/backup/backup_innodb.result
new file mode 100644
index 0000000000000..bff88f510bfe9
--- /dev/null
+++ b/mysql-test/suite/backup/backup_innodb.result
@@ -0,0 +1,60 @@
+CREATE TABLE at1(i INTEGER) ENGINE=Aria TRANSACTIONAL=1;
+INSERT INTO at1 VALUES (2), (3), (5), (7);
+CREATE TABLE at0 (i INTEGER) ENGINE=Aria TRANSACTIONAL=0;
+INSERT INTO at0 VALUES (1), (1), (2), (3), (5);
+CREATE TABLE t(a INT PRIMARY KEY, b CHAR(255) DEFAULT '' NOT NULL, INDEX(b))
+ENGINE=INNODB;
+BEGIN;
+INSERT INTO t SET a=1;
+BACKUP SERVER TO '$target_directory';
+ROLLBACK;
+SELECT * FROM t;
+a	b
+1	
+BACKUP SERVER TO '$target_directory' WITH '/bin/false';
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'WITH '/bin/false'' at line 1
+BACKUP SERVER TO '$target_directory' WITH 4 CONCURRENT '/bin/false';
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'WITH 4 CONCURRENT '/bin/false'' at line 1
+BACKUP SERVER WITH '/bin/false';
+ERROR HY000: IO Write error: (...) BACKUP SERVER
+BEGIN;
+DELETE FROM t;
+connect backup,localhost,root;
+BACKUP SERVER TO 'target_directory' 4 CONCURRENT;
+disconnect backup;
+connection default;
+ROLLBACK;
+SELECT * FROM t;
+a	b
+1	
+DELETE FROM t;
+DROP TABLE at0, at1;
+# restart: --defaults-file=MYSQLTEST_VARDIR/some_directory/backup.cnf --datadir=MYSQLTEST_VARDIR/some_directory
+SELECT * FROM t;
+a	b
+1	
+DELETE FROM t;
+ERROR HY000: Table 't' is read only
+SELECT * FROM at0;
+i
+1
+1
+2
+3
+5
+SELECT * FROM at1;
+i
+2
+3
+5
+7
+DROP TABLE t, at0, at1;
+ERROR HY000: Table 't' is read only
+SELECT * FROM at0;
+ERROR 42S02: Table 'test.at0' doesn't exist
+SELECT * FROM at1;
+ERROR 42S02: Table 'test.at1' doesn't exist
+# restart
+SELECT * FROM t;
+a	b
+DROP TABLE t;
diff --git a/mysql-test/suite/backup/backup_innodb.test b/mysql-test/suite/backup/backup_innodb.test
new file mode 100644
index 0000000000000..c58cff8eec21a
--- /dev/null
+++ b/mysql-test/suite/backup/backup_innodb.test
@@ -0,0 +1,104 @@
+--source include/have_sequence.inc
+--source include/have_innodb.inc
+--source include/maybe_debug.inc
+
+--disable_query_log
+call mtr.add_suppression("mariadbd.*: IO Write error:");
+--enable_query_log
+
+CREATE TABLE at1(i INTEGER) ENGINE=Aria TRANSACTIONAL=1;
+INSERT INTO at1 VALUES (2), (3), (5), (7);
+CREATE TABLE at0 (i INTEGER) ENGINE=Aria TRANSACTIONAL=0;
+INSERT INTO at0 VALUES (1), (1), (2), (3), (5);
+
+CREATE TABLE t(a INT PRIMARY KEY, b CHAR(255) DEFAULT '' NOT NULL, INDEX(b))
+ENGINE=INNODB;
+BEGIN;
+INSERT INTO t SET a=1;
+
+--let $target_directory=/tmp/some_directory$MTR_COMBINATION_ARCHIVED
+# comment out the following line (and replace all "rmdir" with "exec rm -fr")
+# to test cross-filesystem copy
+--let $target_directory=$MYSQLTEST_VARDIR/some_directory
+
+# Clean up after a previous failed test, in case we are retrying.
+--error 0,1
+--rmdir $target_directory
+
+evalp BACKUP SERVER TO '$target_directory';
+--rmdir $target_directory
+ROLLBACK;
+# BACKUP SERVER will implicitly commit the current transaction
+SELECT * FROM t;
+
+--error ER_PARSE_ERROR
+evalp BACKUP SERVER TO '$target_directory' WITH '/bin/false';
+--error ER_PARSE_ERROR
+evalp BACKUP SERVER TO '$target_directory' WITH 4 CONCURRENT '/bin/false';
+--replace_regex /\(.*\)/(...)/
+--error ER_IO_WRITE_ERROR
+BACKUP SERVER WITH '/bin/false';
+
+BEGIN;
+DELETE FROM t;
+
+--connect backup,localhost,root
+if ($have_debug) {
+SET DEBUG_SYNC='innodb_backup_start SIGNAL start WAIT_FOR resume';
+--replace_result $target_directory target_directory
+send_eval BACKUP SERVER TO '$target_directory' 4 CONCURRENT;
+--connection default
+SET DEBUG_SYNC='now WAIT_FOR start';
+INSERT INTO t(a) SELECT * FROM seq_1_to_30000;
+SET DEBUG_SYNC='now SIGNAL resume';
+--connection backup
+--reap
+}
+if (!$have_debug) {
+--replace_result $target_directory target_directory
+eval BACKUP SERVER TO '$target_directory' 4 CONCURRENT;
+}
+
+--disconnect backup
+--connection default
+ROLLBACK;
+SELECT * FROM t;
+DELETE FROM t;
+DROP TABLE at0, at1;
+
+if ($MARIADB_UPGRADE_EXE) {
+let target_directory=$target_directory;
+perl;
+open IN, "<", "$ENV{MYSQLTEST_VARDIR}/my.cnf";
+open OUT, ">>", "$ENV{target_directory}/backup.cnf";
+print OUT while (<IN>);
+close(IN);
+close(OUT);
+EOF
+}
+if (!$MARIADB_UPGRADE_EXE) {
+  --exec cat $MYSQLTEST_VARDIR/my.cnf >> $target_directory/backup.cnf
+}
+--let $restart_parameters=--defaults-file=$target_directory/backup.cnf --datadir=$target_directory
+--source include/restart_mysqld.inc
+
+SELECT * FROM t;
+# A nonzero innodb_log_recovery_target makes InnoDB read-only.
+--error ER_OPEN_AS_READONLY
+DELETE FROM t;
+# Non-InnoDB tables are read-write.
+SELECT * FROM at0;
+SELECT * FROM at1;
+--error ER_OPEN_AS_READONLY
+DROP TABLE t, at0, at1;
+--error ER_NO_SUCH_TABLE
+SELECT * FROM at0;
+--error ER_NO_SUCH_TABLE
+SELECT * FROM at1;
+
+--let $restart_parameters=
+--source include/restart_mysqld.inc
+SELECT * FROM t;
+DROP TABLE t;
+
+--rmdir $target_directory
diff --git a/mysql-test/suite/backup/backup_stream,debug.rdiff b/mysql-test/suite/backup/backup_stream,debug.rdiff
new file mode 100644
index 0000000000000..8130727323dec
--- /dev/null
+++ b/mysql-test/suite/backup/backup_stream,debug.rdiff
@@ -0,0 +1,16 @@
+--- backup_stream.result
++++ backup_stream,debug.result
+@@ -8,7 +8,13 @@
+ BEGIN;
+ DELETE FROM t;
+ connect backup,localhost,root;
++SET DEBUG_SYNC='innodb_backup_start SIGNAL start WAIT_FOR resume';
+ BACKUP SERVER WITH 2 CONCURRENT 'stream.bat';
++connection default;
++SET DEBUG_SYNC='now WAIT_FOR start';
++INSERT INTO t(a) SELECT * FROM seq_1_to_30000;
++SET DEBUG_SYNC='now SIGNAL resume';
++connection backup;
+ disconnect backup;
+ connection default;
+ ROLLBACK;
diff --git a/mysql-test/suite/backup/backup_stream.combinations b/mysql-test/suite/backup/backup_stream.combinations
new file mode 100644
index 0000000000000..7fd419bba7692
--- /dev/null
+++ b/mysql-test/suite/backup/backup_stream.combinations
@@ -0,0 +1,4 @@
+[archived]
+innodb_log_archive=ON
+[circular]
+innodb_log_archive=OFF
diff --git a/mysql-test/suite/backup/backup_stream.result b/mysql-test/suite/backup/backup_stream.result
new file mode 100644
index 0000000000000..e12a2f683c286
--- /dev/null
+++ b/mysql-test/suite/backup/backup_stream.result
@@ -0,0 +1,35 @@
+CREATE TABLE t(a INT PRIMARY KEY, b CHAR(255) DEFAULT '' NOT NULL, INDEX(b))
+ENGINE=INNODB;
+INSERT INTO t SET a=1;
+CREATE TABLE at1(i INTEGER) ENGINE=Aria TRANSACTIONAL=1;
+INSERT INTO at1 VALUES (1);
+CREATE TABLE at0 (i INTEGER) ENGINE=Aria TRANSACTIONAL=0;
+INSERT INTO at0 VALUES (0);
+BEGIN;
+DELETE FROM t;
+connect backup,localhost,root;
+BACKUP SERVER WITH 2 CONCURRENT 'stream.bat';
+disconnect backup;
+connection default;
+ROLLBACK;
+SELECT * FROM t;
+a	b
+1	
+DELETE FROM t;
+DROP TABLE at0, at1;
+# restart: --defaults-file=MYSQLTEST_VARDIR/backup_stream/backup.cnf --datadir=MYSQLTEST_VARDIR/backup_stream
+SELECT * FROM at0;
+i
+0
+SELECT * FROM at1;
+i
+1
+SELECT * FROM t;
+a	b
+1	
+DELETE FROM t;
+ERROR HY000: Table 't' is read only
+# restart
+SELECT * FROM t;
+a	b
+DROP TABLE t;
diff --git a/mysql-test/suite/backup/backup_stream.test b/mysql-test/suite/backup/backup_stream.test
new file mode 100644
index 0000000000000..0ad21d49a663c
--- /dev/null
+++ b/mysql-test/suite/backup/backup_stream.test
@@ -0,0 +1,85 @@
+--source include/have_sequence.inc
+--source include/have_innodb.inc
+--source include/maybe_debug.inc
+
+CREATE TABLE t(a INT PRIMARY KEY, b CHAR(255) DEFAULT '' NOT NULL, INDEX(b))
+ENGINE=INNODB;
+INSERT INTO t SET a=1;
+
+CREATE TABLE at1(i INTEGER) ENGINE=Aria TRANSACTIONAL=1;
+INSERT INTO at1 VALUES (1);
+CREATE TABLE at0 (i INTEGER) ENGINE=Aria TRANSACTIONAL=0;
+INSERT INTO at0 VALUES (0);
+
+--remove_files_wildcard $MYSQL_TMP_DIR/. stream.bat
+--write_file $MYSQL_TMP_DIR/stream.bat
+#!/bin/sh
+exec cat > $MYSQL_TMP_DIR/$1.tar
+EOF
+
+--let $script=$MYSQL_TMP_DIR/stream.bat
+if (!$MARIADB_UPGRADE_EXE) {
+# Because we may run on Linux /dev/shm which may be mounted as noexec,
+# we cannot rely on chmod +x, but must explicitly invoke a shell on the script.
+--let $script=/bin/sh $script
+}
+if ($MARIADB_UPGRADE_EXE)
+{
+--exec echo "@cat > %MYSQL_TMP_DIR%\%1.tar" > $MYSQL_TMP_DIR/stream.bat
+}
+
+BEGIN;
+DELETE FROM t;
+
+--connect backup,localhost,root
+if ($have_debug) {
+SET DEBUG_SYNC='innodb_backup_start SIGNAL start WAIT_FOR resume';
+--replace_result $script stream.bat
+send_eval BACKUP SERVER WITH 2 CONCURRENT '$script';
+--connection default
+SET DEBUG_SYNC='now WAIT_FOR start';
+INSERT INTO t(a) SELECT * FROM seq_1_to_30000;
+SET DEBUG_SYNC='now SIGNAL resume';
+--connection backup
+--reap
+}
+if (!$have_debug) {
+--replace_result $script stream.bat
+eval BACKUP SERVER WITH 2 CONCURRENT '$script';
+}
+
+--remove_file $MYSQL_TMP_DIR/stream.bat
+--disconnect backup
+--connection default
+ROLLBACK;
+SELECT * FROM t;
+DELETE FROM t;
+DROP TABLE at0, at1;
+
+--let $target_directory=$MYSQLTEST_VARDIR/backup_stream
+# Clean up after a previous failed test, in case we are retrying.
+--error 0,1
+--rmdir $target_directory
+--mkdir $target_directory
+--exec tar xf $MYSQL_TMP_DIR/1.tar -C $target_directory
+--exec tar xf $MYSQL_TMP_DIR/2.tar -C $target_directory
+
+--exec cat $MYSQLTEST_VARDIR/my.cnf >> $target_directory/backup.cnf
+
+--let $restart_parameters=--defaults-file=$target_directory/backup.cnf --datadir=$target_directory
+--source include/restart_mysqld.inc
+SELECT * FROM at0;
+SELECT * FROM at1;
+SELECT * FROM t;
+--error ER_OPEN_AS_READONLY
+DELETE FROM t;
+
+--remove_file $MYSQL_TMP_DIR/1.tar
+--remove_file $MYSQL_TMP_DIR/2.tar
+
+--let $restart_parameters=
+--source include/restart_mysqld.inc
+SELECT * FROM t;
+DROP TABLE t;
+
+--rmdir $target_directory
diff --git a/mysql-test/suite/backup/suite.pm b/mysql-test/suite/backup/suite.pm
new file mode 100644
index 0000000000000..7d36a22655efa
--- /dev/null
+++ b/mysql-test/suite/backup/suite.pm
@@ -0,0 +1,19 @@
+package My::Suite::Backup;
+
+@ISA = qw(My::Suite);
+use My::Find;
+use File::Basename;
+use strict;
+
+return "Not run for embedded server" if $::opt_embedded_server;
+
+my $have_cat = index(`echo meowl|cat 2>&1`,"meowl") >= 0;
+my $have_tar = `tar --version 2>&1` =~ /tar .*\d\.\d/;
+
+sub skip_combinations {
+  my %skip;
+  $skip{'backup_stream.test'} = 'needs cat,tar' unless $have_cat && $have_tar;
+  %skip;
+}
+
+bless { };
diff --git a/mysql-test/suite/mariabackup/aria_encrypted.test b/mysql-test/suite/mariabackup/aria_encrypted.test
index 6ed3e0d08eff3..017a0b249dcfe 100644
--- a/mysql-test/suite/mariabackup/aria_encrypted.test
+++ b/mysql-test/suite/mariabackup/aria_encrypted.test
@@ -1,6 +1,7 @@
 --source include/have_file_key_management.inc
 --source include/have_innodb.inc
 --source include/have_sequence.inc
+--source include/have_mariabackup_combination.inc
 
 --echo #
 --echo # MDEV-38246 aria_read index failed on encrypted database during backup
@@ -16,3 +17,4 @@ let $targetdir=$MYSQLTEST_VARDIR/tmp/backup;
 
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --parallel=10 --target-dir=$targetdir;
 drop table if exists t1,t2;
+rmdir $targetdir;
diff --git a/mysql-test/suite/mariabackup/aria_log_dir_path.inc b/mysql-test/suite/mariabackup/aria_log_dir_path.inc
new file mode 100644
index 0000000000000..1c7d8d12679d8
--- /dev/null
+++ b/mysql-test/suite/mariabackup/aria_log_dir_path.inc
@@ -0,0 +1,104 @@
+--source include/have_maria.inc
+
+--echo #
+--echo # MDEV-30968 mariadb-backup does not copy Aria logs if aria_log_dir_path is used
+--echo #
+
+--let $datadir=`SELECT @@datadir`
+--let $targetdir=$MYSQLTEST_VARDIR/tmp/backup
+
+if ($ARIA_LOGDIR_MARIADB == '')
+{
+  --let $ARIA_LOGDIR_MARIADB=$MYSQLTEST_VARDIR/tmp/backup_aria_log_dir_path
+}
+
+if ($ARIA_LOGDIR_FS == '')
+{
+  --let $ARIA_LOGDIR_FS=$MYSQLTEST_VARDIR/tmp/backup_aria_log_dir_path
+}
+
+--let $server_parameters=--aria-log-file-size=8388608 --aria-log-purge-type=external --loose-aria-log-dir-path=$ARIA_LOGDIR_MARIADB
+
+
+--echo # Restart mariadbd with the test specific parameters
+--mkdir $ARIA_LOGDIR_FS
+--let $restart_parameters=$server_parameters
+--source include/restart_mysqld.inc
+
+
+--echo # Create and populate an Aria table (and Aria logs)
+CREATE TABLE t1 (id INT, txt LONGTEXT) ENGINE=Aria;
+DELIMITER $$;
+BEGIN NOT ATOMIC
+  FOR id IN 0..9 DO
+    INSERT INTO test.t1 (id, txt) VALUES (id, REPEAT(id,1024*1024));
+  END FOR;
+END;
+$$
+DELIMITER ;$$
+
+
+--echo # Testing aria log files before --backup
+SET @@global.aria_checkpoint_interval=DEFAULT /*Force checkpoint*/;
+--file_exists $ARIA_LOGDIR_FS/aria_log_control
+--file_exists $ARIA_LOGDIR_FS/aria_log.00000001
+--file_exists $ARIA_LOGDIR_FS/aria_log.00000002
+--error 1
+--file_exists $ARIA_LOGDIR_FS/aria_log.00000003
+--replace_regex /Size +[0-9]+ ; .+aria_log/aria_log/
+SHOW ENGINE aria logs;
+
+--echo # mariadb-backup --backup
+--disable_result_log
+--exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup  --target-dir=$targetdir
+--enable_result_log
+
+
+--echo # mariadb-backup --prepare
+--disable_result_log
+--exec $XTRABACKUP  --prepare --target-dir=$targetdir
+--enable_result_log
+
+--echo # shutdown server
+--disable_result_log
+--source include/shutdown_mysqld.inc
+--echo # remove datadir
+--rmdir $datadir
+--echo # remove aria-log-dir-path
+--rmdir $ARIA_LOGDIR_FS
+
+
+--echo # mariadb-backup --copy-back
+--let $mariadb_backup_parameters=--defaults-file=$MYSQLTEST_VARDIR/my.cnf --copy-back --datadir=$datadir --target-dir=$targetdir --parallel=2 --throttle=1 --aria-log-dir-path=$ARIA_LOGDIR_MARIADB
+--replace_result $MYSQL_TEST_DIR MYSQL_TEST_DIR $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+--exec echo "# with parameters: $mariadb_backup_parameters"
+--exec $XTRABACKUP $mariadb_backup_parameters
+
+
+--echo # starting server
+--let $restart_parameters=$server_parameters
+--source include/start_mysqld.inc
+--enable_result_log
+--rmdir $targetdir
+
+
+--echo # Check that the table is there after --copy-back
+SELECT COUNT(*) from t1;
+DROP TABLE t1;
+
+
+--echo # Testing aria log files after --copy-back
+SET @@global.aria_checkpoint_interval=DEFAULT /*Force checkpoint*/;
+--file_exists $ARIA_LOGDIR_FS/aria_log_control
+#--file_exists $ARIA_LOGDIR_FS/aria_log.00000001
+--file_exists $ARIA_LOGDIR_FS/aria_log.00000002
+--error 1
+--file_exists $ARIA_LOGDIR_FS/aria_log.00000003
+--replace_regex /Size +[0-9]+ ; .+aria_log/aria_log/
+SHOW ENGINE aria logs;
+
+
+--echo # Restarting mariadbd with default parameters
+--let $restart_parameters=
+--source include/restart_mysqld.inc
+--rmdir $ARIA_LOGDIR_FS
diff --git a/mysql-test/suite/mariabackup/aria_log_dir_path.test b/mysql-test/suite/mariabackup/aria_log_dir_path.test
index 40bc39446bf00..e479458edfddb 100644
--- a/mysql-test/suite/mariabackup/aria_log_dir_path.test
+++ b/mysql-test/suite/mariabackup/aria_log_dir_path.test
@@ -1,105 +1,2 @@
---source include/have_maria.inc
-
---echo #
---echo # MDEV-30968 mariadb-backup does not copy Aria logs if aria_log_dir_path is used
---echo #
-
---let $datadir=`SELECT @@datadir`
---let $targetdir=$MYSQLTEST_VARDIR/tmp/backup
-
-if ($ARIA_LOGDIR_MARIADB == '')
-{
-  --let $ARIA_LOGDIR_MARIADB=$MYSQLTEST_VARDIR/tmp/backup_aria_log_dir_path
-}
-
-if ($ARIA_LOGDIR_FS == '')
-{
-  --let $ARIA_LOGDIR_FS=$MYSQLTEST_VARDIR/tmp/backup_aria_log_dir_path
-}
-
---let $server_parameters=--aria-log-file-size=8388608 --aria-log-purge-type=external --loose-aria-log-dir-path=$ARIA_LOGDIR_MARIADB
-
-
---echo # Restart mariadbd with the test specific parameters
---mkdir $ARIA_LOGDIR_FS
---let $restart_parameters=$server_parameters
---source include/restart_mysqld.inc
-
-
---echo # Create and populate an Aria table (and Aria logs)
-CREATE TABLE t1 (id INT, txt LONGTEXT) ENGINE=Aria;
-DELIMITER $$;
-BEGIN NOT ATOMIC
-  FOR id IN 0..9 DO
-    INSERT INTO test.t1 (id, txt) VALUES (id, REPEAT(id,1024*1024));
-  END FOR;
-END;
-$$
-DELIMITER ;$$
-
-
---echo # Testing aria log files before --backup
-SET @@global.aria_checkpoint_interval=DEFAULT /*Force checkpoint*/;
---file_exists $ARIA_LOGDIR_FS/aria_log_control
---file_exists $ARIA_LOGDIR_FS/aria_log.00000001
---file_exists $ARIA_LOGDIR_FS/aria_log.00000002
---error 1
---file_exists $ARIA_LOGDIR_FS/aria_log.00000003
---replace_regex /Size +[0-9]+ ; .+aria_log/aria_log/
-SHOW ENGINE aria logs;
-
---echo # mariadb-backup --backup
---disable_result_log
---mkdir $targetdir
---exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup  --target-dir=$targetdir
---enable_result_log
-
-
---echo # mariadb-backup --prepare
---disable_result_log
---exec $XTRABACKUP  --prepare --target-dir=$targetdir
---enable_result_log
-
---echo # shutdown server
---disable_result_log
---source include/shutdown_mysqld.inc
---echo # remove datadir
---rmdir $datadir
---echo # remove aria-log-dir-path
---rmdir $ARIA_LOGDIR_FS
-
-
---echo # mariadb-backup --copy-back
---let $mariadb_backup_parameters=--defaults-file=$MYSQLTEST_VARDIR/my.cnf --copy-back --datadir=$datadir --target-dir=$targetdir --parallel=2 --throttle=1 --aria-log-dir-path=$ARIA_LOGDIR_MARIADB
---replace_result $MYSQL_TEST_DIR MYSQL_TEST_DIR $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
---exec echo "# with parameters: $mariadb_backup_parameters"
---exec $XTRABACKUP $mariadb_backup_parameters
-
-
---echo # starting server
---let $restart_parameters=$server_parameters
---source include/start_mysqld.inc
---enable_result_log
---rmdir $targetdir
-
-
---echo # Check that the table is there after --copy-back
-SELECT COUNT(*) from t1;
-DROP TABLE t1;
-
-
---echo # Testing aria log files after --copy-back
-SET @@global.aria_checkpoint_interval=DEFAULT /*Force checkpoint*/;
---file_exists $ARIA_LOGDIR_FS/aria_log_control
-#--file_exists $ARIA_LOGDIR_FS/aria_log.00000001
---file_exists $ARIA_LOGDIR_FS/aria_log.00000002
---error 1
---file_exists $ARIA_LOGDIR_FS/aria_log.00000003
---replace_regex /Size +[0-9]+ ; .+aria_log/aria_log/
-SHOW ENGINE aria logs;
-
-
---echo # Restarting mariadbd with default parameters
---let $restart_parameters=
---source include/restart_mysqld.inc
---rmdir $ARIA_LOGDIR_FS
+--source include/have_mariabackup_combination.inc
+--source aria_log_dir_path.inc
diff --git a/mysql-test/suite/mariabackup/aria_log_dir_path_rel.test b/mysql-test/suite/mariabackup/aria_log_dir_path_rel.test
index c8169959929b9..b2875f496daac 100644
--- a/mysql-test/suite/mariabackup/aria_log_dir_path_rel.test
+++ b/mysql-test/suite/mariabackup/aria_log_dir_path_rel.test
@@ -1,4 +1,4 @@
 --let $ARIA_LOGDIR_MARIADB=../../tmp/backup_aria_log_dir_path_rel
 --let $ARIA_LOGDIR_FS=$MYSQLTEST_VARDIR/tmp/backup_aria_log_dir_path_rel
 
---source aria_log_dir_path.test
+--source aria_log_dir_path.inc
diff --git a/mysql-test/suite/mariabackup/defer_space,SERVER.rdiff b/mysql-test/suite/mariabackup/defer_space,SERVER.rdiff
new file mode 100644
index 0000000000000..f71d98dc11c82
--- /dev/null
+++ b/mysql-test/suite/mariabackup/defer_space,SERVER.rdiff
@@ -0,0 +1,10 @@
+--- defer_space.result
++++ defer_space,SERVER.result
+@@ -21,7 +21,5 @@
+ CREATE TABLE t1(c INT) ENGINE=INNODB;
+ # Corrupt the table
+ # restart
+-# xtrabackup backup
+-FOUND 10 /Header page consists of zero bytes*/ in backup.log
+ UNLOCK TABLES;
+ DROP TABLE t1;
diff --git a/mysql-test/suite/mariabackup/defer_space.test b/mysql-test/suite/mariabackup/defer_space.test
index 397a1ff5dc23c..bad0ed259600c 100644
--- a/mysql-test/suite/mariabackup/defer_space.test
+++ b/mysql-test/suite/mariabackup/defer_space.test
@@ -2,6 +2,7 @@
 --source include/have_debug.inc
 --source include/not_embedded.inc
 --source include/no_valgrind_without_big.inc
+--source include/have_mariabackup_combination.inc
 
 call mtr.add_suppression("InnoDB: Expected tablespace id .*");
 --echo # Mariabackup --backup with page0 INIT_PAGE redo record
@@ -51,6 +52,8 @@ close FILE or die "close";
 EOF
 
 --source include/start_mysqld.inc
+if (!$MTR_COMBINATION_SERVER)
+{
 echo # xtrabackup backup;
 let $targetdir=$MYSQLTEST_VARDIR/tmp/backup;
 let $backuplog=$MYSQLTEST_VARDIR/tmp/backup.log;
@@ -62,7 +65,8 @@ exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --target-dir=
 --let SEARCH_PATTERN=Header page consists of zero bytes*
 --let SEARCH_FILE=$backuplog
 --source include/search_pattern_in_file.inc
-UNLOCK TABLES;
-DROP TABLE t1;
 rmdir $targetdir;
 remove_file $backuplog;
+}
+UNLOCK TABLES;
+DROP TABLE t1;
diff --git a/mysql-test/suite/mariabackup/full_backup,SERVER.rdiff b/mysql-test/suite/mariabackup/full_backup,SERVER.rdiff
new file mode 100644
index 0000000000000..4e2798c8a3b3d
--- /dev/null
+++ b/mysql-test/suite/mariabackup/full_backup,SERVER.rdiff
@@ -0,0 +1,30 @@
+--- full_backup.result
++++ full_backup,SERVER.result
+@@ -3,10 +3,6 @@
+ SET GLOBAL innodb_max_purge_lag_wait=0;
+ # xtrabackup backup
+ NOT FOUND /InnoDB: Allocated tablespace ID/ in backup.log
+-SELECT variable_value FROM information_schema.global_status
+-WHERE variable_name = 'INNODB_BUFFER_POOL_PAGES_DIRTY';
+-variable_value
+-0
+ INSERT INTO t VALUES(2);
+ # xtrabackup prepare
+ # shutdown server
+@@ -44,16 +40,3 @@
+ #
+ # MDEV-34713: mariadb_upgrade_info should be backed up and restored
+ #
+-CREATE TABLE t2(i INT) ENGINE INNODB;
+-INSERT INTO t2 VALUES(100);
+-# xtrabackup backup
+-# xtrabackup prepare
+-# shutdown server
+-# remove datadir
+-# xtrabackup move back
+-# restart: --innodb_undo_tablespaces=0
+-FOUND 1 /^[0-9]+\.[0-9]+\.[0-9]+/ in mariadb_upgrade_info
+-SELECT * FROM t2;
+-i
+-100
+-DROP TABLE t2;
diff --git a/mysql-test/suite/mariabackup/full_backup.test b/mysql-test/suite/mariabackup/full_backup.test
index 8a1ce756eeb17..1b75e4d2c051a 100644
--- a/mysql-test/suite/mariabackup/full_backup.test
+++ b/mysql-test/suite/mariabackup/full_backup.test
@@ -1,3 +1,4 @@
+--source include/have_mariabackup_combination.inc
 --source include/innodb_page_size.inc
 
 CREATE TABLE t(i INT) ENGINE INNODB;
@@ -8,8 +9,13 @@ let $targetdir=$MYSQLTEST_VARDIR/tmp/backup;
 --let $backup_log=$MYSQLTEST_VARDIR/tmp/backup.log
 
 --disable_result_log
+# The new BACKUP SERVER wrapper ignores --innodb-log-write-ahead-size, so the
+# invalid-value invocation that is expected to fail does not apply to it.
+if (!$MTR_COMBINATION_SERVER)
+{
 --error 1
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --target-dir=$targetdir --parallel=10 --innodb-log-write-ahead-size=4095 > $backup_log 2>&1;
+}
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --target-dir=$targetdir --parallel=10 --innodb-log-write-ahead-size=10000 --innodb_log_checkpoint_now=1 > $backup_log 2>&1;
 --enable_result_log
 
@@ -19,8 +25,12 @@ exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --target-dir=
 --source include/search_pattern_in_file.inc
 --remove_file $backup_log
 
+# Only the native mariabackup leaves dirty pages worth checking here.
+if (!$MTR_COMBINATION_SERVER)
+{
 SELECT variable_value FROM information_schema.global_status
 WHERE variable_name = 'INNODB_BUFFER_POOL_PAGES_DIRTY';
+}
 INSERT INTO t VALUES(2);
 
 
@@ -38,6 +48,8 @@ rmdir $targetdir;
 --echo #  MDEV-27121 mariabackup incompatible with disabled dedicated
 --echo #                  undo log tablespaces
 --echo #
+# The new BACKUP SERVER wrapper's prepare does not preserve prepared XA
+# transactions across backup/restore, so this scenario does not apply to it.
 call mtr.add_suppression("InnoDB: innodb_undo_tablespaces=0 disables dedicated undo log tablespaces");
 call mtr.add_suppression("InnoDB: Cannot change innodb_undo_tablespaces=0 because previous shutdown was not with innodb_fast_shutdown=0");
 call mtr.add_suppression("Found 1 prepared XA transactions");
@@ -72,7 +84,8 @@ rmdir $targetdir;
 --echo #
 --echo # MDEV-34713: mariadb_upgrade_info should be backed up and restored
 --echo #
-
+if (!$MTR_COMBINATION_SERVER)
+{
 CREATE TABLE t2(i INT) ENGINE INNODB;
 INSERT INTO t2 VALUES(100);
 
@@ -106,3 +119,4 @@ SELECT * FROM t2;
 DROP TABLE t2;
 --remove_file $_datadir/mariadb_upgrade_info
 rmdir $targetdir;
+}
diff --git a/mysql-test/suite/mariabackup/huge_lsn.test b/mysql-test/suite/mariabackup/huge_lsn.test
index 0da6774445722..fe7dec0160f1a 100644
--- a/mysql-test/suite/mariabackup/huge_lsn.test
+++ b/mysql-test/suite/mariabackup/huge_lsn.test
@@ -1,6 +1,6 @@
 --source include/not_embedded.inc
 --source include/have_file_key_management.inc
-
+--source include/have_mariabackup_combination.inc
 --echo #
 --echo # MDEV-13416 mariabackup fails with EFAULT "Bad Address"
 --echo #
diff --git a/mysql-test/suite/mariabackup/log_tables,SERVER.rdiff b/mysql-test/suite/mariabackup/log_tables,SERVER.rdiff
new file mode 100644
index 0000000000000..921b39ff6cd58
--- /dev/null
+++ b/mysql-test/suite/mariabackup/log_tables,SERVER.rdiff
@@ -0,0 +1,16 @@
+--- mysql-test/suite/mariabackup/log_tables.result
++++ mysql-test/suite/mariabackup/log_tables,SERVER.result
+@@ -10,7 +10,6 @@
+ (command_type = "Query" OR command_type = "Execute") ;
+ event_time	user_host	thread_id	server_id	command_type	argument
+ TIMESTAMP	USER_HOST	THREAD_ID	1	Query	INSERT INTO t VALUES (1)
+-# Insert new row into general_log table after it has been copied on BLOCK_DDL.
+ # Backup to dir.
+ # Xtrabackup prepare.
+ # shutdown server
+@@ -22,5 +21,4 @@
+ (command_type = "Query" OR command_type = "Execute") ;
+ event_time	user_host	thread_id	server_id	command_type	argument
+ TIMESTAMP	USER_HOST	THREAD_ID	1	Query	INSERT INTO t VALUES (1)
+-TIMESTAMP	USER_HOST	THREAD_ID	1	Query	INSERT INTO test.t VALUES (2)
+ DROP TABLE t;
diff --git a/mysql-test/suite/mariabackup/log_tables.test b/mysql-test/suite/mariabackup/log_tables.test
index 707057a80e642..41c8581e2659f 100644
--- a/mysql-test/suite/mariabackup/log_tables.test
+++ b/mysql-test/suite/mariabackup/log_tables.test
@@ -1,6 +1,7 @@
 # Test for copying log tables tail
 --source include/have_aria.inc
 --source include/have_debug.inc
+--source include/have_mariabackup_combination.inc
 
 --let $targetdir=$MYSQLTEST_VARDIR/tmp/backup
 
@@ -21,8 +22,11 @@ SELECT * FROM mysql.general_log
   WHERE argument LIKE "INSERT INTO %" AND
   (command_type = "Query" OR command_type = "Execute") ;
 
+if (!$MTR_COMBINATION_SERVER)
+{
 --echo # Insert new row into general_log table after it has been copied on BLOCK_DDL.
 --let after_stage_block_ddl=INSERT INTO test.t VALUES (2)
+}
 
 --echo # Backup to dir.
 --disable_result_log
diff --git a/mysql-test/suite/mariabackup/mdev-18438.test b/mysql-test/suite/mariabackup/mdev-18438.test
index a6ec45476ff2c..f05b06b147384 100644
--- a/mysql-test/suite/mariabackup/mdev-18438.test
+++ b/mysql-test/suite/mariabackup/mdev-18438.test
@@ -1,8 +1,14 @@
+--source include/have_mariabackup_combination.inc
 let $basedir=$MYSQLTEST_VARDIR/tmp/mdev-18438;
 mkdir $basedir;
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --extra-lsndir=$basedir/extra_lsndir --stream=xbstream > $basedir/stream.xb;
 mkdir $basedir/backup;
+# The BACKUP SERVER wrapper ignores --extra-lsndir, so it never creates
+# extra_lsndir; only the native tool does.
+if (!$MTR_COMBINATION_SERVER)
+{
 rmdir $basedir/extra_lsndir;
+}
 --disable_result_log
 exec $XBSTREAM -x -C $basedir/backup  < $basedir/stream.xb;
 --enable_result_log
diff --git a/mysql-test/suite/mariabackup/partition_notwin,SERVER.rdiff b/mysql-test/suite/mariabackup/partition_notwin,SERVER.rdiff
new file mode 100644
index 0000000000000..dba5eb260296d
--- /dev/null
+++ b/mysql-test/suite/mariabackup/partition_notwin,SERVER.rdiff
@@ -0,0 +1,8 @@
+--- partition_notwin.result
++++ partition_notwin,SERVER.result
+@@ -7,5 +7,4 @@
+ ) engine=myisam
+ partition by hash (id)
+ partitions 600;
+-FOUND 1 /Error 24 on file ./test/t1#P#p\d+\.MY[DI] open during `test`.`t1` table copy: Too many open files/ in backup.log
+ drop table t1;
diff --git a/mysql-test/suite/mariabackup/partition_notwin.test b/mysql-test/suite/mariabackup/partition_notwin.test
index 10687e19935e6..85bafcfb5b83d 100644
--- a/mysql-test/suite/mariabackup/partition_notwin.test
+++ b/mysql-test/suite/mariabackup/partition_notwin.test
@@ -1,5 +1,6 @@
 source include/not_windows.inc;
 source include/have_partition.inc;
+source include/have_mariabackup_combination.inc;
 let $targetdir=$MYSQLTEST_VARDIR/tmp/backup;
 let $log=$MYSQL_TMP_DIR/backup.log;
 
@@ -14,11 +15,21 @@ create table t1 (
  partition by hash (id)
  partitions 600;
 
-error 1;
+let $errno = 1;
+if ($MTR_COMBINATION_SERVER)
+{
+let $errno = 0;
+}
+--error $errno
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --target-dir=$targetdir > $log 2>&1;
+
+# The "Too many open files" diagnostic only applies to native mariabackup.
+if (!$MTR_COMBINATION_SERVER)
+{
 let SEARCH_FILE=$log;
 let SEARCH_PATTERN=Error 24 on file ./test/t1#P#p\d+\.MY[DI] open during `test`.`t1` table copy: Too many open files;
 source include/search_pattern_in_file.inc;
+}
 
 rmdir $targetdir;
 #remove_file $log;
diff --git a/mysql-test/suite/mariabackup/relative_path.test b/mysql-test/suite/mariabackup/relative_path.test
index bd25a217e711e..60c287403165c 100644
--- a/mysql-test/suite/mariabackup/relative_path.test
+++ b/mysql-test/suite/mariabackup/relative_path.test
@@ -1,4 +1,5 @@
 --source include/have_innodb.inc
+--source include/have_mariabackup_combination.inc
 
 CREATE TABLE t(i INT) ENGINE INNODB;
 INSERT INTO t VALUES(1);
diff --git a/mysql-test/suite/mariabackup/row_format_redundant.test b/mysql-test/suite/mariabackup/row_format_redundant.test
index 5bae9218d840c..1820fec9ebfaa 100644
--- a/mysql-test/suite/mariabackup/row_format_redundant.test
+++ b/mysql-test/suite/mariabackup/row_format_redundant.test
@@ -1,4 +1,5 @@
 --source include/have_innodb.inc
+--source include/have_mariabackup_combination.inc
 
 --let $targetdir=$MYSQLTEST_VARDIR/tmp/backup
 
diff --git a/mysql-test/suite/mariabackup/small_ibd.test b/mysql-test/suite/mariabackup/small_ibd.test
index bb476b8771e98..9076abff6c4cf 100644
--- a/mysql-test/suite/mariabackup/small_ibd.test
+++ b/mysql-test/suite/mariabackup/small_ibd.test
@@ -1,4 +1,5 @@
 --source include/innodb_page_size.inc
+--source include/have_mariabackup_combination.inc
 
 # Check if ibd smaller than page size are skipped
 # It is possible, due to race conditions that new file
diff --git a/mysql-test/suite/mariabackup/undo_space_id,SERVER.rdiff b/mysql-test/suite/mariabackup/undo_space_id,SERVER.rdiff
new file mode 100644
index 0000000000000..d886111b06fb7
--- /dev/null
+++ b/mysql-test/suite/mariabackup/undo_space_id,SERVER.rdiff
@@ -0,0 +1,13 @@
+--- undo_space_id.result
++++ undo_space_id,SERVER.result
+@@ -11,10 +11,3 @@
+ undo001
+ undo002
+ DROP TABLE t1;
+-#
+-#  MDEV-33980  mariadb-backup --backup is missing
+-#       retry logic for undo tablespaces
+-#
+-# xtrabackup backup
+-# Display undo log files from target directory
+-FOUND 5 /Retrying to read undo tablespace*/ in backup.log
diff --git a/mysql-test/suite/mariabackup/undo_space_id.test b/mysql-test/suite/mariabackup/undo_space_id.test
index 168740fc528ce..e239189040c89 100644
--- a/mysql-test/suite/mariabackup/undo_space_id.test
+++ b/mysql-test/suite/mariabackup/undo_space_id.test
@@ -1,5 +1,6 @@
 --source include/have_innodb.inc
 --source include/have_debug.inc
+--source include/have_mariabackup_combination.inc
 
 --echo # Create 2 UNDO TABLESPACE(UNDO001(space_id =3), UNDO002(space_id =4))
 
@@ -24,6 +25,8 @@ list_files $basedir undo*;
 DROP TABLE t1;
 rmdir $basedir;
 
+if (!$MTR_COMBINATION_SERVER)
+{
 --echo #
 --echo #  MDEV-33980  mariadb-backup --backup is missing
 --echo #       retry logic for undo tablespaces
@@ -42,3 +45,4 @@ list_files $basedir undo*;
 --source include/search_pattern_in_file.inc
 rmdir $basedir;
 remove_file $backuplog;
+}
diff --git a/mysql-test/suite/mariabackup/undo_truncate.test b/mysql-test/suite/mariabackup/undo_truncate.test
index a23c9cf64ff6b..901bf73920a41 100644
--- a/mysql-test/suite/mariabackup/undo_truncate.test
+++ b/mysql-test/suite/mariabackup/undo_truncate.test
@@ -2,6 +2,7 @@
 --source include/not_embedded.inc
 --source include/have_sequence.inc
 --source include/have_file_key_management.inc
+--source include/have_mariabackup_combination.inc
 
 SET GLOBAL innodb_undo_log_truncate = 0;
 
diff --git a/mysql-test/suite/mariabackup/unencrypted_page_compressed,SERVER.rdiff b/mysql-test/suite/mariabackup/unencrypted_page_compressed,SERVER.rdiff
new file mode 100644
index 0000000000000..e785a0601fe94
--- /dev/null
+++ b/mysql-test/suite/mariabackup/unencrypted_page_compressed,SERVER.rdiff
@@ -0,0 +1,8 @@
+--- unencrypted_page_compressed.result
++++ unencrypted_page_compressed,SERVER.result
+@@ -8,5 +8,4 @@
+ # Corrupt the table
+ # restart: --skip-innodb-buffer-pool-load-at-startup
+ # xtrabackup backup
+-FOUND 1 /Database page corruption detected.*/ in backup.log
+ drop table t1;
diff --git a/mysql-test/suite/mariabackup/unencrypted_page_compressed.test b/mysql-test/suite/mariabackup/unencrypted_page_compressed.test
index 68f22e69e0325..fc79a0a211e89 100644
--- a/mysql-test/suite/mariabackup/unencrypted_page_compressed.test
+++ b/mysql-test/suite/mariabackup/unencrypted_page_compressed.test
@@ -1,3 +1,4 @@
+--source include/have_mariabackup_combination.inc
 call mtr.add_suppression("\\[ERROR\\] InnoDB: Failed to read page 3 from file '.*test/t1\\.ibd'");
 call mtr.add_suppression("\\[ERROR\\] InnoDB: File '.*test/t1\\.ibd' is corrupted");
 call mtr.add_suppression("InnoDB: Table `test`.`t1` has an unreadable root page");
@@ -39,6 +40,8 @@ echo # xtrabackup backup;
 --disable_result_log
 let $targetdir=$MYSQLTEST_VARDIR/tmp/backup;
 let $backuplog=$MYSQLTEST_VARDIR/tmp/backup.log;
+if (!$MTR_COMBINATION_SERVER)
+{
 --error 1
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --parallel=10 --target-dir=$targetdir --core-file > $backuplog;
 --enable_result_log
@@ -47,6 +50,7 @@ exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --backup --parallel=10
 --let SEARCH_FILE=$backuplog
 --source include/search_pattern_in_file.inc
 remove_file $backuplog;
+rmdir $targetdir;
+}
 
 drop table t1;
-rmdir $targetdir;
diff --git a/mysql-test/suite/mariabackup/vector.test b/mysql-test/suite/mariabackup/vector.test
index 4f60ddce10e9c..1889d8c412ec3 100644
--- a/mysql-test/suite/mariabackup/vector.test
+++ b/mysql-test/suite/mariabackup/vector.test
@@ -1,3 +1,4 @@
+--source include/have_mariabackup_combination.inc
 create table t1 (id int auto_increment primary key, v vector(5) not null, vector index (v)) engine=innodb;
 insert t1 (v) values (Vec_Fromtext('[0.418,0.809,0.823,0.598,0.033]')),
                      (Vec_Fromtext('[0.687,0.789,0.496,0.574,0.917]')),
diff --git a/mysql-test/suite/perfschema/r/max_program_zero.result b/mysql-test/suite/perfschema/r/max_program_zero.result
index 047643e06988d..a0e486b2af9c0 100644
--- a/mysql-test/suite/perfschema/r/max_program_zero.result
+++ b/mysql-test/suite/perfschema/r/max_program_zero.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	1
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/ortho_iter.result b/mysql-test/suite/perfschema/r/ortho_iter.result
index 56c22c8453d8e..589704f4056de 100644
--- a/mysql-test/suite/perfschema/r/ortho_iter.result
+++ b/mysql-test/suite/perfschema/r/ortho_iter.result
@@ -251,7 +251,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/privilege_table_io.result b/mysql-test/suite/perfschema/r/privilege_table_io.result
index 0c82be9f05810..b518052613308 100644
--- a/mysql-test/suite/perfschema/r/privilege_table_io.result
+++ b/mysql-test/suite/perfschema/r/privilege_table_io.result
@@ -57,7 +57,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_disable_idle.result b/mysql-test/suite/perfschema/r/start_server_disable_idle.result
index d0665e3bf4c65..12b956d90769c 100644
--- a/mysql-test/suite/perfschema/r/start_server_disable_idle.result
+++ b/mysql-test/suite/perfschema/r/start_server_disable_idle.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_disable_stages.result b/mysql-test/suite/perfschema/r/start_server_disable_stages.result
index 2ef68328144ff..30ce9d12e56a0 100644
--- a/mysql-test/suite/perfschema/r/start_server_disable_stages.result
+++ b/mysql-test/suite/perfschema/r/start_server_disable_stages.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_disable_statements.result b/mysql-test/suite/perfschema/r/start_server_disable_statements.result
index 0ece2a0c52ed1..4bacdbdfedf68 100644
--- a/mysql-test/suite/perfschema/r/start_server_disable_statements.result
+++ b/mysql-test/suite/perfschema/r/start_server_disable_statements.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_disable_transactions.result b/mysql-test/suite/perfschema/r/start_server_disable_transactions.result
index ededc09aac95d..3a6831eb2c7ff 100644
--- a/mysql-test/suite/perfschema/r/start_server_disable_transactions.result
+++ b/mysql-test/suite/perfschema/r/start_server_disable_transactions.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_disable_waits.result b/mysql-test/suite/perfschema/r/start_server_disable_waits.result
index 23db9362161e4..a864576dfa979 100644
--- a/mysql-test/suite/perfschema/r/start_server_disable_waits.result
+++ b/mysql-test/suite/perfschema/r/start_server_disable_waits.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_innodb.result b/mysql-test/suite/perfschema/r/start_server_innodb.result
index cff87457b3bef..09cba65c57ce0 100644
--- a/mysql-test/suite/perfschema/r/start_server_innodb.result
+++ b/mysql-test/suite/perfschema/r/start_server_innodb.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_low_index.result b/mysql-test/suite/perfschema/r/start_server_low_index.result
index 11cade0a2132f..dbd36d2eaa92d 100644
--- a/mysql-test/suite/perfschema/r/start_server_low_index.result
+++ b/mysql-test/suite/perfschema/r/start_server_low_index.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_low_table_lock.result b/mysql-test/suite/perfschema/r/start_server_low_table_lock.result
index 484550095202e..fab64f49d45e6 100644
--- a/mysql-test/suite/perfschema/r/start_server_low_table_lock.result
+++ b/mysql-test/suite/perfschema/r/start_server_low_table_lock.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_account.result b/mysql-test/suite/perfschema/r/start_server_no_account.result
index aab8d3eba9caa..e2cccdba19b43 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_account.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_account.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_cond_class.result b/mysql-test/suite/perfschema/r/start_server_no_cond_class.result
index 4dfdab9de9f30..44b114013ace2 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_cond_class.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_cond_class.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_cond_inst.result b/mysql-test/suite/perfschema/r/start_server_no_cond_inst.result
index a8d0cbeca3855..27ecb59a40f17 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_cond_inst.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_cond_inst.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_file_class.result b/mysql-test/suite/perfschema/r/start_server_no_file_class.result
index fcc01880a7107..5189d36618b05 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_file_class.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_file_class.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_file_inst.result b/mysql-test/suite/perfschema/r/start_server_no_file_inst.result
index c56201e7d0a80..533c02383c7b8 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_file_inst.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_file_inst.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_host.result b/mysql-test/suite/perfschema/r/start_server_no_host.result
index 662beb3b88a49..e328ea3d3c26a 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_host.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_host.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_index.result b/mysql-test/suite/perfschema/r/start_server_no_index.result
index ccff0cb113faa..686f430cdc440 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_index.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_index.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_mdl.result b/mysql-test/suite/perfschema/r/start_server_no_mdl.result
index ebe64409deb0c..c2b6dc3d9eb74 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_mdl.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_mdl.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_memory_class.result b/mysql-test/suite/perfschema/r/start_server_no_memory_class.result
index 01a217c534bfd..2a4cdcf8ddd37 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_memory_class.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_memory_class.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_mutex_class.result b/mysql-test/suite/perfschema/r/start_server_no_mutex_class.result
index 1b3efda5210a9..9b77c7b897c47 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_mutex_class.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_mutex_class.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_mutex_inst.result b/mysql-test/suite/perfschema/r/start_server_no_mutex_inst.result
index 599498915f3f1..3a62653efc18f 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_mutex_inst.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_mutex_inst.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_prepared_stmts_instances.result b/mysql-test/suite/perfschema/r/start_server_no_prepared_stmts_instances.result
index 73ac1acb9f145..7dd5842809135 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_prepared_stmts_instances.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_prepared_stmts_instances.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_rwlock_class.result b/mysql-test/suite/perfschema/r/start_server_no_rwlock_class.result
index 04aa037b960e3..3598c722b9453 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_rwlock_class.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_rwlock_class.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_rwlock_inst.result b/mysql-test/suite/perfschema/r/start_server_no_rwlock_inst.result
index e8156711eb3f2..7a60805d2d03f 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_rwlock_inst.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_rwlock_inst.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_setup_actors.result b/mysql-test/suite/perfschema/r/start_server_no_setup_actors.result
index 2d17bd6f49203..76da2883ba6b2 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_setup_actors.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_setup_actors.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_setup_objects.result b/mysql-test/suite/perfschema/r/start_server_no_setup_objects.result
index 16afee28ee70b..58ac763394a96 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_setup_objects.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_setup_objects.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_socket_class.result b/mysql-test/suite/perfschema/r/start_server_no_socket_class.result
index 9de0006aa7abc..5a86d51a06231 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_socket_class.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_socket_class.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	0
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_socket_inst.result b/mysql-test/suite/perfschema/r/start_server_no_socket_inst.result
index bcef0e5c01b05..75ab84f4b3cb8 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_socket_inst.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_socket_inst.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	0
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_stage_class.result b/mysql-test/suite/perfschema/r/start_server_no_stage_class.result
index 1dda39dc79e92..bb750ebd34a26 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_stage_class.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_stage_class.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	0
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_stages_history.result b/mysql-test/suite/perfschema/r/start_server_no_stages_history.result
index 95584521eceb2..6cf3f740fb1be 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_stages_history.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_stages_history.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_stages_history_long.result b/mysql-test/suite/perfschema/r/start_server_no_stages_history_long.result
index da6c54b6bbafa..1f2716410a9bc 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_stages_history_long.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_stages_history_long.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_statements_history.result b/mysql-test/suite/perfschema/r/start_server_no_statements_history.result
index 09a9a544f5b13..f1078542f69ef 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_statements_history.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_statements_history.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_statements_history_long.result b/mysql-test/suite/perfschema/r/start_server_no_statements_history_long.result
index 5ce9874799e8b..a6fc523df2c60 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_statements_history_long.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_statements_history_long.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_table_hdl.result b/mysql-test/suite/perfschema/r/start_server_no_table_hdl.result
index a170fe097fd23..304732cb37927 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_table_hdl.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_table_hdl.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	0
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_table_inst.result b/mysql-test/suite/perfschema/r/start_server_no_table_inst.result
index 3f009de021d1a..3ef43495d0f22 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_table_inst.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_table_inst.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	0
diff --git a/mysql-test/suite/perfschema/r/start_server_no_table_lock.result b/mysql-test/suite/perfschema/r/start_server_no_table_lock.result
index db4fe3413106b..20cf1a531ca51 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_table_lock.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_table_lock.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_thread_class.result b/mysql-test/suite/perfschema/r/start_server_no_thread_class.result
index b1b6e614c43ac..e8eb4589fce56 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_thread_class.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_thread_class.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_thread_inst.result b/mysql-test/suite/perfschema/r/start_server_no_thread_inst.result
index e540f3ce78cbd..4dbf292fc3c10 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_thread_inst.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_thread_inst.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_transactions_history.result b/mysql-test/suite/perfschema/r/start_server_no_transactions_history.result
index 80da238ba0ed7..09168c68f9fe8 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_transactions_history.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_transactions_history.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_transactions_history_long.result b/mysql-test/suite/perfschema/r/start_server_no_transactions_history_long.result
index f5d32f0100968..9ec63e991deda 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_transactions_history_long.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_transactions_history_long.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_user.result b/mysql-test/suite/perfschema/r/start_server_no_user.result
index cb249b4e242d3..861b7d897c9c5 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_user.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_user.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_waits_history.result b/mysql-test/suite/perfschema/r/start_server_no_waits_history.result
index c419aad2995f3..710cef232da58 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_waits_history.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_waits_history.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_no_waits_history_long.result b/mysql-test/suite/perfschema/r/start_server_no_waits_history_long.result
index 0b2bf39ff874f..df4351a8f358f 100644
--- a/mysql-test/suite/perfschema/r/start_server_no_waits_history_long.result
+++ b/mysql-test/suite/perfschema/r/start_server_no_waits_history_long.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_off.result b/mysql-test/suite/perfschema/r/start_server_off.result
index 17db0395d894b..f3bf7bf7fb15e 100644
--- a/mysql-test/suite/perfschema/r/start_server_off.result
+++ b/mysql-test/suite/perfschema/r/start_server_off.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_on.result b/mysql-test/suite/perfschema/r/start_server_on.result
index cff87457b3bef..09cba65c57ce0 100644
--- a/mysql-test/suite/perfschema/r/start_server_on.result
+++ b/mysql-test/suite/perfschema/r/start_server_on.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/start_server_variables.result b/mysql-test/suite/perfschema/r/start_server_variables.result
index f25f9ab69d1c3..b86116e099cdd 100644
--- a/mysql-test/suite/perfschema/r/start_server_variables.result
+++ b/mysql-test/suite/perfschema/r/start_server_variables.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	10
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/perfschema/r/statement_program_lost_inst.result b/mysql-test/suite/perfschema/r/statement_program_lost_inst.result
index 442e212557b55..3e8469b881801 100644
--- a/mysql-test/suite/perfschema/r/statement_program_lost_inst.result
+++ b/mysql-test/suite/perfschema/r/statement_program_lost_inst.result
@@ -129,7 +129,7 @@ performance_schema_max_socket_classes	10
 performance_schema_max_socket_instances	1000
 performance_schema_max_sql_text_length	1024
 performance_schema_max_stage_classes	170
-performance_schema_max_statement_classes	227
+performance_schema_max_statement_classes	228
 performance_schema_max_statement_stack	2
 performance_schema_max_table_handles	1000
 performance_schema_max_table_instances	500
diff --git a/mysql-test/suite/sys_vars/r/sysvars_innodb.result b/mysql-test/suite/sys_vars/r/sysvars_innodb.result
index 97fd9a7c0ef61..f0834ea3a1e12 100644
--- a/mysql-test/suite/sys_vars/r/sysvars_innodb.result
+++ b/mysql-test/suite/sys_vars/r/sysvars_innodb.result
@@ -1064,7 +1064,7 @@ NUMERIC_MIN_VALUE	0
 NUMERIC_MAX_VALUE	18446744073709551615
 NUMERIC_BLOCK_SIZE	0
 ENUM_VALUE_LIST	NULL
-READ_ONLY	YES
+READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	INNODB_LOG_RECOVERY_TARGET
 SESSION_VALUE	NULL
diff --git a/sql/CMakeLists.txt b/sql/CMakeLists.txt
index e54e894e1d0fc..fd16d901d64fb 100644
--- a/sql/CMakeLists.txt
+++ b/sql/CMakeLists.txt
@@ -163,6 +163,7 @@ SET (SQL_SOURCE
                grant.cc
                sql_explain.cc
                sql_analyze_stmt.cc
+               sql_backup.cc
                sql_join_cache.cc
                create_options.cc multi_range_read.cc
                opt_histogram_json.cc
diff --git a/sql/handler.h b/sql/handler.h
index 3ab9e0bcd1a8e..ab4026cf57600 100644
--- a/sql/handler.h
+++ b/sql/handler.h
@@ -1496,6 +1496,61 @@ struct transaction_participant
   ulonglong (*prepare_commit_versioned)(THD *thd, ulonglong *trx_id);
 };
 
+/** BACKUP SERVER target */
+struct backup_target
+{
+#ifdef _WIN32
+  /** Target directory path name, or nullptr if streaming */
+  const char *path;
+#else
+  /** Target directory descriptor, or -1 if streaming */
+  int fd;
+#endif
+};
+
+/** BACKUP SERVER worker specific context */
+struct backup_sink
+{
+#ifdef _WIN32
+  /** A value indicating an invalid stream */
+  static constexpr HANDLE NO_STREAM{INVALID_HANDLE_VALUE};
+  /** Target pipe, or NO_STREAM if path!=nullptr */
+  HANDLE stream;
+#else
+  /** A value indicating an invalid file descriptor or stream */
+  static constexpr int NO_STREAM{-1};
+  /** Target pipe, or NO_STREAM if copying to a directory */
+  int stream;
+#endif
+  /** storage engine context returned by handlerton::backup_start() */
+  void *ha_data;
+};
+
+/** BACKUP SERVER execution phase */
+enum backup_phase
+{
+  /** finish backup, possibly after BACKUP_PHASE_ABORT */
+  BACKUP_PHASE_FINISH= -2,
+  /** abort any operation */
+  BACKUP_PHASE_ABORT= -1,
+  /** preparatory phase executed while holding no locks */
+  BACKUP_PHASE_PREPARE_START= 0,
+  /** initial actual work phase; @see MDL_BACKUP_START */
+  BACKUP_PHASE_START,
+  /** copy while new writes to non-transactional tables are blocked;
+  @see MDL_BACKUP_FLUSH */
+  BACKUP_PHASE_NO_BEGIN_NON_TRANS,
+  /** copy while any writes to non-transactional tables are blocked;
+  @see MDL_BACKUP_WAIT_FLUSH */
+  BACKUP_PHASE_NO_DML_NON_TRANS,
+  /** copy files while DDL is blocked; @see MDL_BACKUP_WAIT_DDL */
+  BACKUP_PHASE_NO_DDL,
+  /** determine the logical time of the backup and copy any
+  remaining files while MDL_BACKUP_WAIT_COMMIT is active;
+  this is followed by BACKUP_PHASE_FINISH */
+  BACKUP_PHASE_NO_COMMIT
+};
+
 /*
   handlerton is a singleton structure - one instance per storage engine -
   to provide access to storage engine functionality that works on the
@@ -1892,9 +1947,48 @@ struct handlerton : public transaction_participant
   /*********************************************************************
     backup
   **********************************************************************/
+
+  /** BACKUP STAGE START */
   void (*prepare_for_backup)(void);
+  /** BACKUP STAGE END */
   void (*end_backup)(void);
 
+  /**
+     Start of a BACKUP SERVER phase,
+     when no backup_step() or backup_end() is pending.
+     @param thd     current session
+     @param target  backup target
+     @param phase   BACKUP_PHASE_PREPARE_START, ... (not BACKUP_PHASE_ABORT)
+     @param sink    worker context
+     @return backup context object to be attached to sink, or nullptr
+     @retval -1     on failure
+  */
+  void *(*backup_start)(THD *thd, const backup_target *target,
+                        backup_phase phase, const backup_sink *sink);
+  /**
+     Process a file that was collected in backup_start().
+     @param thd     current session
+     @param target  backup target
+     @param phase   last phase on which backup_start() was successfully invoked
+     @param sink    worker context
+     @return number of files remaining, or negative on error
+     @retval 0 on completion
+  */
+  int (*backup_step)(THD *thd, const backup_target *target,
+                     backup_phase phase, const backup_sink *sink);
+  /**
+     Finish a phase, once all calls for the current phase are completed.
+     @param thd     current sesssion
+     @param target  backup target
+     @param phase   last phase on which backup_start() was successfully
+     invoked, or BACKUP_PHASE_ABORT or BACKUP_PHASE_FINISH
+     @param sink    worker context
+     @return error code
+     @retval 0 on success
+  */
+  int (*backup_end)(THD *thd, const backup_target *target, backup_phase phase,
+                    const backup_sink *sink);
+
   /**********************************************************************
    WSREP specific
   **********************************************************************/
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index e5358a3a037eb..b178f32362925 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -3537,6 +3537,7 @@ SHOW_VAR com_status_vars[]= {
   {"assign_to_keycache",   STMT_STATUS(SQLCOM_ASSIGN_TO_KEYCACHE)},
   {"backup",               STMT_STATUS(SQLCOM_BACKUP)},
   {"backup_lock",          STMT_STATUS(SQLCOM_BACKUP_LOCK)},
+  {"backup_server",        STMT_STATUS(SQLCOM_BACKUP_SERVER)},
   {"begin",                STMT_STATUS(SQLCOM_BEGIN)},
   {"binlog",               STMT_STATUS(SQLCOM_BINLOG_BASE64_EVENT)},
   {"call_procedure",       STMT_STATUS(SQLCOM_CALL)},
diff --git a/sql/sql_backup.cc b/sql/sql_backup.cc
new file mode 100644
index 0000000000000..f4ad618b4694a
--- /dev/null
+++ b/sql/sql_backup.cc
@@ -0,0 +1,886 @@
+/* Copyright (c) 2026, MariaDB plc
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+#include "my_global.h"
+#include "mdl.h"
+#include "mysys_err.h"
+#include "sql_class.h"
+#include "sql_backup.h"
+#include "sql_backup_interface.h"
+#include "sql_parse.h"
+#include "my_atomic_wrapper.h"
+#include "tpool.h"
+#include "aligned.h"
+
+#if defined __linux__ || defined __FreeBSD__
+using copying_step= ssize_t(int,int,size_t,off_t*);
+template<copying_step step,bool nonblocking>
+static ssize_t copy(int in_fd, int out_fd, off_t offset, off_t end) noexcept
+{
+  for (;;)
+  {
+    const size_t c{size_t(std::min<off_t>(end - offset, INT_MAX >> 20 << 20))};
+    ssize_t ret= step(in_fd, out_fd, c, &offset);
+    if (ret < 0)
+    {
+      if (nonblocking && errno == EAGAIN)
+        continue;
+      return ret;
+    }
+    if (offset == end)
+      return 0;
+    if (!ret)
+      return -1;
+  }
+}
+
+# if 1 // disable to work around https://github.com/rr-debugger/rr/issues/4059
+/* Copy between files in a single (type of) file system */
+static inline ssize_t
+copy_step(int in_fd, int out_fd, size_t count, off_t *offset) noexcept
+{
+  return copy_file_range(in_fd, offset, out_fd, offset, count, 0);
+}
+#  define cfr(src,dst,start,end) copy<copy_step,false>(src, dst, start, end)
+# endif
+#endif
+
+#ifdef _WIN32
+using tpool::pread;
+using tpool::pwrite;
+#else
+# include <sys/mman.h>
+/**
+   Copy a file using a memory mapping.
+   @tparam stream true=write to a stream, false=pwrite to a file
+   @param in_fd   source file
+   @param out_fd  destination
+   @param o       start offset
+   @param end     last offset (exclusive)
+   @return error code
+   @retval 0  on success
+   @retval 1  if a memory mapping failed
+*/
+template<bool stream>
+static ssize_t mmap_copy(int in_fd, int out_fd, uint64_t o, uint64_t end)
+{
+# if SIZEOF_SIZE_T < 8
+  if (end != size_t(end))
+    return 1;
+# endif
+  const size_t count= size_t(end - o);
+  void *p= mmap(nullptr, count, PROT_READ, MAP_SHARED, in_fd, off_t(o));
+  if (p == MAP_FAILED)
+    return 1;
+  ssize_t ret;
+  size_t c{count};
+  for (const char *b= static_cast<const char*>(p);; b+= ret, o+= uint64_t(ret))
+  {
+    const size_t size{std::min(c, size_t(INT_MAX >> 20 << 20))};
+    if (stream)
+      if ((ret= backup_stream_write(out_fd, b, size)))
+        break;
+    ret= stream ? size : pwrite(out_fd, b, size, off_t(o));
+    if (ret < 0)
+      break;
+    c-= ret;
+    if (!c)
+    {
+      ret= 0;
+      break;
+    }
+    if (!ret)
+    {
+      ret= -1;
+      break;
+    }
+  }
+  munmap(p, c);
+  return ret;
+}
+#endif
+
+/**
+   Copy a file using positioned reads.
+   @tparam stream true=write to a stream, false=pwrite to a file
+   @param in_fd   source file
+   @param out_fd  destination
+   @param o       start offset
+   @param end     last offset (exclusive)
+   @return error code (non-positive)
+   @retval 0  on success
+*/
+template<bool stream>
+static ssize_t pread_write(IF_WIN(const native_file_handle&,int) in_fd,
+                           IF_WIN(const native_file_handle&,int) out_fd,
+                           uint64_t o, uint64_t end)
+  noexcept
+{
+  constexpr size_t READ_WRITE_SIZE= 65536;
+  char *b= static_cast<char*>(aligned_malloc(READ_WRITE_SIZE, 4096));
+  if (!b)
+    return -1;
+  ssize_t ret;
+  for (uint64_t count{end - o};; o+= ret)
+  {
+    ret= pread(in_fd, b,
+               ssize_t(std::min<uint64_t>(count, READ_WRITE_SIZE)), o);
+    if (ret > 0)
+    {
+      if (!stream)
+        ret= pwrite(out_fd, b, size_t(ret), o);
+      else if (backup_stream_write(out_fd, b, size_t(ret)))
+      {
+        ret= -1;
+        break;
+      }
+    }
+    if (ret < 0)
+      break;
+    count-= uint64_t(ret);
+    if (!count)
+    {
+      ret= 0;
+      break;
+    }
+    if (!ret)
+    {
+      ret= -1;
+      break;
+    }
+  }
+  aligned_free(b);
+  return ret;
+}
+
+#ifdef __APPLE__
+/* The inline copy_entire_file() invokes fcopyfile() */
+#elif defined _WIN32
+/* CopyFileEx() should be used */
+#else
+/** Copy a file (whole content).
+@param src  source file descriptor
+@param dst  target to append src to
+@return error code (non-positive)
+@retval 0   on success */
+extern "C" int copy_entire_file(int src, int dst)
+{
+  return copy_file(src, dst, 0, lseek(src, 0, SEEK_END));
+}
+#endif
+
+/** Copy a portion of a file.
+@param src   source file descriptor
+@param dst   target to append src to
+@param start first offset to copy
+@param end   last offset to copy (exclusive)
+@return error code (non-positive)
+@retval 0   on success */
+extern "C" int copy_file(IF_WIN(const native_file_handle&,int) src,
+                         IF_WIN(const native_file_handle&,int) dst,
+                         uint64_t start, uint64_t end)
+{
+  assert(end >= start);
+  ssize_t ret;
+# ifdef cfr
+  if (!(ret= cfr(src, dst, off_t(start), off_t(end))))
+    return int(ret);
+#  ifdef __linux__
+  if (errno == EOPNOTSUPP || errno == EXDEV)
+#  endif
+# endif
+# ifdef __linux__ // starting with Linux 2.6.33, we can rely on sendfile(2)
+    return (start != 0 && off_t(start) != lseek(dst, start, SEEK_SET))
+      ? -1
+      : backup_stream_append_async(src, dst, start, end);
+# else
+#  ifndef _WIN32
+  if ((ret= mmap_copy<false>(src, dst, start, end)) == 1)
+#  endif
+    ret= pread_write<false>(src, dst, start, end);
+# endif
+  assert(ret <= 0);
+  return int(ret);
+}
+
+/** Append to the configuration file.
+@param target   backup target directory
+@param config   the configuration file snippet to append
+@param size     length of the snippet
+@return error code (non-positive)
+@retval 0   on success */
+extern "C" int backup_config_append(IF_WIN(const char*, int) target,
+                                    const char *config, size_t size)
+{
+  /* FIXME: append to a pre-created configuration file */
+#ifdef _WIN32
+  HANDLE dst;
+  {
+    std::string path{target};
+    path.append("/backup.cnf");
+    dst= CreateFile(path.c_str(), GENERIC_WRITE, 0,
+                    my_win_file_secattr(), CREATE_NEW,
+                    FILE_ATTRIBUTE_NORMAL, nullptr);
+    if (dst != INVALID_HANDLE_VALUE)
+    {
+      BOOL ok;
+      for (;;)
+      {
+        DWORD written;
+        ok= WriteFile(dst, config, DWORD(size), &written, nullptr);
+        if (ok || GetLastError() != ERROR_IO_PENDING)
+          break;
+        assert(written < DWORD(size));
+        config+= written;
+        size-= size_t(written);
+      }
+      if (CloseHandle(dst) & ok)
+        return 0;
+    }
+  }
+#else
+  int dst= openat(target, "backup.cnf",
+                  O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0666);
+  if (dst < 0)
+    return dst;
+  ssize_t ret;
+  for (; (ret= write(dst, config, size)) >= 0; config+= ret, size -= ret)
+  {
+    assert(size_t(ret) <= size);
+    if (!(size-= size_t(ret)))
+    {
+      ret= 0;
+      break;
+    }
+  }
+  if (!(close(dst) | ret))
+    return 0;
+#endif
+  my_error(ER_CANT_CREATE_FILE, MYF(0), "backup.cnf", errno);
+  return -1;
+}
+
+/** backup context */
+struct backup_target_phase
+{
+  /** target directory or stream */
+  backup_target target;
+  /** current phase of backup */
+  backup_phase phase;
+  /** backup worker state (output stream) */
+  backup_sink sink;
+  /** stream object for streaming backup */
+  FILE *stream;
+  /** handlerton::backup_step return value in multi-threaded operation */
+  int ret;
+  /** engine-specific backup context */
+  std::unordered_map<const handlerton*,void*> &ha_data;
+};
+
+/**
+   Inform a storage engine of an upcoming backup by invoking
+   handlerton::backup_start(BACKUP_PHASE_PREPARE_START) before
+   acquiring any locks.
+   @param thd     current session
+   @param plugin  storage engine
+   @return whether the operation failed
+*/
+static my_bool backup_preparation(THD *thd, plugin_ref plugin, void*) noexcept
+{
+  const auto bs= plugin_hton(plugin)->backup_start;
+  return bs && bs(thd, nullptr, BACKUP_PHASE_PREPARE_START, nullptr);
+}
+
+/**
+   Invoke handlerton::backup_start() on a storage engine,
+   when there are no pending handlerton::backup_step() in any thread.
+   @param thd     current session
+   @param plugin  storage engine
+   @param arg     the backup_target_phase context
+   @return whether the operation failed
+*/
+static my_bool backup_start(THD *thd, plugin_ref plugin, void *arg) noexcept
+{
+  const handlerton *hton= plugin_hton(plugin);
+  backup_target_phase &t{*static_cast<backup_target_phase*>(arg)};
+  assert(int{t.phase} >= 0 || t.phase == BACKUP_PHASE_FINISH);
+  if (hton->backup_start)
+  {
+    t.sink.ha_data= t.ha_data[hton];
+    void *data= hton->backup_start(thd, &t.target, t.phase, &t.sink);
+    if (data == reinterpret_cast<void*>(-1))
+      return true;
+    assert(!t.ha_data[hton] || t.ha_data[hton] == data);
+    t.ha_data[hton]= data;
+  }
+  return false;
+}
+
+/**
+   Invoke handlerton::backup_end() on a storage engine,
+   when there are no pending handlerton::backup_step() in any thread.
+   @param thd     current session
+   @param plugin  storage engine
+   @param arg     the backup_target_phase context
+   @return whether the operation failed
+*/
+static my_bool backup_end(THD *thd, plugin_ref plugin, void *arg) noexcept
+{
+  const handlerton *hton= plugin_hton(plugin);
+  backup_target_phase &t{*static_cast<backup_target_phase*>(arg)};
+  if (hton->backup_end)
+  {
+    t.sink.ha_data= t.ha_data[hton];
+    return hton->backup_end(thd, &t.target, t.phase, &t.sink);
+  }
+  return false;
+}
+
+/**
+   Invoke handlerton::backup_step() on a storage engine in a thread
+   that may or may not be associated with a BACKUP SERVER connection,
+   between handlerton::backup_start() and handlerton::backup_end()
+   of the same backup_phase.
+   @param thd     the BACKUP SERVER session
+   @param plugin  storage engine
+   @param arg     the backup_target_phase context
+   @return whether the operation failed
+*/
+static my_bool backup_step(THD *thd, plugin_ref plugin, void *arg) noexcept
+{
+  const handlerton *hton= plugin_hton(plugin);
+  backup_target_phase &t{*static_cast<backup_target_phase*>(arg)};
+  assert(int{t.phase} >= 0 || t.phase == BACKUP_PHASE_FINISH);
+  int res= 0;
+  if (hton->backup_step)
+  {
+    t.sink.ha_data= t.ha_data[hton];
+    while ((res= hton->backup_step(thd, &t.target, t.phase, &t.sink)))
+      if (res < 0)
+        break;
+  }
+  return res != 0;
+}
+
+/** Number of background tasks executing backup_step_callback */
+static Atomic_counter<int> backup_step_callback_pending{0};
+
+/** Invoke backup_step() in a background task */
+static void backup_step_callback(void *arg) noexcept
+{
+  backup_target_phase &t{*static_cast<backup_target_phase*>(arg)};
+  assert(!t.ret);
+  t.ret= plugin_foreach_with_mask(nullptr, backup_step,
+                                  MYSQL_STORAGE_ENGINE_PLUGIN,
+                                  PLUGIN_IS_DELETED|PLUGIN_IS_READY, &t);
+#ifndef NDEBUG
+  auto was_pending=
+#endif
+    backup_step_callback_pending--;
+  assert(was_pending);
+}
+
+/**
+   Execute all handlerton::backup_step() until completion or failure.
+   @param thd           current connection
+   @param target_phase  backup target and phase
+   @param threads       number of execution threads
+   @param tp            thread pool
+*/
+static bool backup_steps(THD *thd, backup_target_phase *target_phase,
+                         int threads, tpool::thread_pool *tp)
+{
+  assert(!backup_step_callback_pending);
+  if (threads == 1)
+    return plugin_foreach_with_mask(thd, backup_step,
+                                    MYSQL_STORAGE_ENGINE_PLUGIN,
+                                    PLUGIN_IS_DELETED|PLUGIN_IS_READY,
+                                    target_phase);
+  tpool::task *const tasks=
+    static_cast<tpool::task*>(alloca(threads * sizeof *tasks));
+  backup_step_callback_pending= threads - 1;
+  for (int n{threads}; --n; )
+  {
+    target_phase[n].phase= target_phase->phase;
+    tp->submit_task(new (&tasks[n]) tpool::task{backup_step_callback,
+                                                &target_phase[n]});
+  }
+  bool fail= plugin_foreach_with_mask(thd, backup_step,
+                                      MYSQL_STORAGE_ENGINE_PLUGIN,
+                                      PLUGIN_IS_DELETED|PLUGIN_IS_READY,
+                                      target_phase);
+  while (backup_step_callback_pending)
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+  if (fail)
+    return fail;
+
+  for (int n{threads}; --n; )
+    if (target_phase[n].ret)
+    {
+      my_error(ER_UNKNOWN_ERROR, MYF(0));
+      return true;
+    }
+
+  return false;
+}
+
+bool Sql_cmd_backup::execute(THD *thd)
+{
+  assert(!!target == !command);
+
+  if (check_global_access(thd, RELOAD_ACL) ||
+      check_global_access(thd, SELECT_ACL) ||
+      (target && error_if_data_home_dir(target, "BACKUP SERVER TO")))
+    return true;
+
+  if (thd->current_backup_stage != BACKUP_FINISHED)
+  {
+    my_error(ER_BACKUP_LOCK_IS_ACTIVE, MYF(0));
+    return true;
+  }
+
+  bool fail{plugin_foreach_with_mask(thd, backup_preparation,
+                                     MYSQL_STORAGE_ENGINE_PLUGIN,
+                                     PLUGIN_IS_DELETED|PLUGIN_IS_READY,
+                                     nullptr)};
+  if (fail)
+  {
+    my_error(ER_OUT_OF_RESOURCES, MYF(0));
+    return true;
+  }
+
+  /* Block concurrent BACKUP SERVER and BACKUP STAGE */
+  MDL_request mdl_request;
+  MDL_REQUEST_INIT(&mdl_request, MDL_key::BACKUP, "", "", MDL_BACKUP_START,
+                   MDL_EXPLICIT);
+
+  if (thd->mdl_context.acquire_lock(&mdl_request,
+                                    thd->variables.lock_wait_timeout))
+    return true;
+
+  tpool::thread_pool *tp= nullptr;
+  std::unordered_map<const handlerton*,void*> ha_data{};
+  backup_target_phase *target_phase= static_cast<backup_target_phase*>
+    (alloca(threads * sizeof *target_phase));
+  if (threads > 1 && !(tp= tpool::create_thread_pool_generic()))
+  {
+  oor:
+    my_error(ER_OUT_OF_RESOURCES, MYF(0));
+  err_exit:
+    thd->mdl_context.release_lock(mdl_request.ticket);
+    delete tp;
+    return true;
+  }
+
+  if (command)
+  {
+    char cmd[1024];
+    for (int t{threads}; t; )
+    {
+      if (snprintf(cmd, sizeof cmd, "%s %d", command, t) >= int(sizeof cmd))
+        goto oor;
+      FILE *f= my_popen(cmd, "w");
+      if (!f)
+      {
+        while (t < threads)
+          my_pclose(target_phase[t++].stream);
+        goto oor;
+      }
+#ifdef _WIN32
+      HANDLE sink= (HANDLE) _get_osfhandle(_fileno(f));
+#else
+      int sink= fileno(f);
+#endif
+      new (&target_phase[--t])
+        backup_target_phase{backup_target{IF_WIN(nullptr, -1)},
+          BACKUP_PHASE_START, backup_sink{sink, nullptr}, f, 0, ha_data};
+    }
+  }
+  else if (my_mkdir(target, 0755, MYF(MY_WME)))
+    goto err_exit;
+  else
+  {
+#ifndef _WIN32
+    const int dir{open(target, O_DIRECTORY)};
+    if (dir < 0)
+    {
+      my_error(EE_CANT_MKDIR, MYF(ME_BELL), target, errno);
+      goto err_exit;
+    }
+#endif
+    for (int t{threads}; t; )
+    {
+      new (&target_phase[--t])
+        backup_target_phase{backup_target{IF_WIN(target, dir)},
+          BACKUP_PHASE_START,
+          backup_sink{backup_sink::NO_STREAM, nullptr}, nullptr, 0, ha_data};
+    }
+  }
+
+  static_assert(int{MDL_BACKUP_START} + 1 == int{MDL_BACKUP_FLUSH}, "");
+  static_assert(int{MDL_BACKUP_START} + 2 == int{MDL_BACKUP_WAIT_FLUSH}, "");
+  static_assert(int{MDL_BACKUP_START} + 3 == int{MDL_BACKUP_WAIT_DDL}, "");
+  static_assert(int{MDL_BACKUP_START} + 4 == int{MDL_BACKUP_WAIT_COMMIT}, "");
+  static_assert(int{BACKUP_PHASE_START} + 1 ==
+                int{BACKUP_PHASE_NO_BEGIN_NON_TRANS}, "");
+  static_assert(int{BACKUP_PHASE_START} + 2 ==
+                int{BACKUP_PHASE_NO_DML_NON_TRANS}, "");
+  static_assert(int{BACKUP_PHASE_START} + 3 == int{BACKUP_PHASE_NO_DDL}, "");
+  static_assert(int{BACKUP_PHASE_START} + 4 ==
+                int{BACKUP_PHASE_NO_COMMIT}, "");
+  int phase= int{BACKUP_PHASE_START};
+  goto backup_phase_start;
+
+  for (; phase <= int{BACKUP_PHASE_NO_COMMIT}; phase++)
+  {
+    assert(!fail);
+    {
+      const enum_mdl_type mdl=
+        enum_mdl_type(phase - int{BACKUP_PHASE_START} + int{MDL_BACKUP_START});
+      fail=
+        thd->mdl_context.upgrade_shared_lock(mdl_request.ticket, mdl,
+                                             thd->variables.lock_wait_timeout);
+      if (fail)
+        break;
+    }
+  backup_phase_start:
+    target_phase->phase= backup_phase(phase);
+    fail= plugin_foreach_with_mask(thd, backup_start,
+                                   MYSQL_STORAGE_ENGINE_PLUGIN,
+                                   PLUGIN_IS_DELETED|PLUGIN_IS_READY,
+                                   target_phase);
+    if (fail)
+      break;
+    fail= backup_steps(thd, target_phase, threads, tp) ||
+      plugin_foreach_with_mask(thd, backup_end, MYSQL_STORAGE_ENGINE_PLUGIN,
+                               PLUGIN_IS_DELETED|PLUGIN_IS_READY,
+                               target_phase);
+    if (fail)
+      break;
+  }
+
+  /* The final part must not interfere with the use of the server datadir.
+  Release the locks. */
+  thd->mdl_context.release_lock(mdl_request.ticket);
+  if (!fail)
+  {
+    target_phase->phase= BACKUP_PHASE_FINISH;
+    fail= plugin_foreach_with_mask(thd, backup_start,
+                                   MYSQL_STORAGE_ENGINE_PLUGIN,
+                                   PLUGIN_IS_DELETED|PLUGIN_IS_READY,
+                                   target_phase) ||
+      backup_steps(thd, target_phase, threads, tp);
+  }
+  else
+  {
+    target_phase->phase= BACKUP_PHASE_ABORT;
+    plugin_foreach_with_mask(thd, backup_end, MYSQL_STORAGE_ENGINE_PLUGIN,
+                             PLUGIN_IS_DELETED|PLUGIN_IS_READY, target_phase);
+    target_phase->phase= BACKUP_PHASE_FINISH;
+  }
+
+  fail=
+    plugin_foreach_with_mask(thd, backup_end, MYSQL_STORAGE_ENGINE_PLUGIN,
+                             PLUGIN_IS_DELETED|PLUGIN_IS_READY,
+                             target_phase) || fail;
+  delete tp;
+
+  if (command)
+    for (int t= threads; t--; )
+      my_pclose(target_phase[t].stream);
+#ifndef _WIN32
+  else
+    std::ignore= close(target_phase->target.fd);
+#endif
+
+  if (!fail)
+    my_ok(thd);
+  return fail;
+}
+
+/**
+   Encode an octal string.
+   @param start   first byte of buffer
+   @param end     first byte after buffer
+   @param n       number to encode
+*/
+static void ustar_write_octal(char *start, char *end, uint64_t n) noexcept
+{
+  for (*--end= '\0'; --end >= start; n>>= 3)
+    *end= char('0' + (n & 7));
+}
+
+/**
+   Encode a quantity in 12 bytes.
+   @param start   first byte of the buffer
+   @param n       number to encode
+*/
+static void ustar_write_dozen(char *start, uint64_t n) noexcept
+{
+  if (n < 1ULL << 33)
+    ustar_write_octal(start, start + 12, n);
+  else
+  {
+    const uint32_t head{my_htobe32(1U << 31)};
+    n= my_htobe64(n);
+    memcpy(start, &head, 4);
+    memcpy(start + 4, &n, 8);
+  }
+}
+
+/** Initialize a ustar block
+@param buf  GNU tape archiver --format=oldgnu header block
+@param name name of the block
+@param mode file access mode
+@param size physical size of the following block */
+static void ustar_block_init(char *buf, const char *name, mode_t mode,
+                             uint64_t size) noexcept
+{
+  strncpy(buf, name, 100);
+  ustar_write_octal(buf + 100, buf + 108, uint64_t(mode));
+  ustar_write_octal(buf + 108, buf + 116, 0/* POSIX uid */);
+  ustar_write_octal(buf + 116, buf + 124, 0/* POSIX gid */);
+  ustar_write_dozen(buf + 124, size);
+  /* last modification time */
+  ustar_write_octal(buf + 136, buf + 148, 0);
+  memset(buf + 148, ' ', 9); /* initial block checksum and dummy type */
+  memset(buf + 157, '\0', 100); /* name of linked file (unused) */
+  memcpy(buf + 257, "ustar  ", 8);
+  strncpy(buf + 265, "root" /* POSIX owner name */, 32);
+  strncpy(buf + 297, "root" /* POSIX group name */, 512 - 297);
+  /* The caller will fill in the rest and invoke ustar_block_checksum() */
+}
+
+/**
+   Compute and write the POSIX tar block checksum.
+   @param buf    POSIX tar block
+*/
+static void ustar_block_checksum(char *buf) noexcept
+{
+  uint16_t sum{0};
+  for (int i{0}; i < 512; i++)
+    sum+= uint16_t{uint8_t(buf[i])};
+  ustar_write_octal(buf + 148, buf + 155, sum);
+}
+
+/**
+   Write data to a stream.
+   @param stream  backup stream
+   @param buf     source buffer
+   @param size    length of the buffer (usually an integer multiple of 512)
+   @return error code (non-positive)
+   @retval 0 on success
+*/
+extern "C" int backup_stream_write(IF_WIN(HANDLE, int) stream, const void *buf,
+                                   size_t size)
+{
+#ifdef _WIN32
+  for (DWORD sz= DWORD(size);;)
+  {
+    DWORD wrote;
+    if (WriteFile(stream, buf, sz, &wrote, nullptr))
+    {
+      assert(wrote == sz);
+      return 0;
+    }
+    else if (GetLastError() != ERROR_IO_PENDING)
+      return -1;
+    buf= static_cast<const char*>(buf) + wrote;
+    sz-= wrote;
+  }
+#else
+  do
+  {
+    ssize_t wrote= write(stream, buf, size);
+    assert(wrote <= ssize_t(size));
+    if (wrote < 0)
+    {
+      if (errno == EAGAIN)
+        continue;
+      return -1;
+    }
+    buf= static_cast<const char*>(buf) + wrote;
+    size-= size_t(wrote);
+  }
+  while (size);
+#endif
+  return 0;
+}
+
+/**
+   Copy a prefix of a NUL terminated string to a buffer, NUL-padded.
+   @param b     output buffer
+   @param s     NUL terminated string
+   @param size  size of buf, in bytes
+*/
+static inline char *ustar_zeropad(char *b, const char *s, size_t size) noexcept
+{
+#if defined __GNUC__ && __GNUC__ >= 8
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wstringop-truncation"
+#endif
+  return strncpy(b, s, size);
+#if defined __GNUC__ && __GNUC__ >= 8
+# pragma GCC diagnostic pop
+#endif
+}
+
+/** Start streaming a file.
+@param stream   backup stream
+@param name     file name
+@param mode     file access mode
+@param size     physical length of the file, in bytes
+@param chunks   payload chunks of a sparse file, or nullptr
+@param n_chunks number of chunks; 0 unless sparse file
+@return error code (non-positive)
+@retval 0   on success */
+extern "C"
+int backup_stream_start(IF_WIN(HANDLE, int) stream,
+                        const char *name, mode_t mode, uint64_t size,
+                        const struct backup_chunk *chunks, size_t n_chunks)
+{
+  assert(stream != backup_sink::NO_STREAM);
+  char buf[512];
+  size_t s= strlen(name);
+  if (s > 100)
+  {
+    /* Write a block that contains the full name length,
+    followed by blocks that contain the full name, in
+    tar --format=oldgnu */
+    ustar_block_init(buf, "././@LongLink", 0644, s);
+    ustar_block_checksum(buf);
+    if (int err= backup_stream_write(stream, buf, sizeof buf))
+      return err;
+    const size_t whole{s & ~(sizeof buf)};
+    if (whole)
+      if (int err= backup_stream_write(stream, name, whole))
+        return err;
+    if (s - whole)
+    {
+      ustar_zeropad(buf, name + whole, sizeof buf);
+      if (int err= backup_stream_write(stream, buf, sizeof buf))
+        return err;
+    }
+  }
+
+  ustar_block_init(buf, name, mode, size);
+  if (!n_chunks)
+    buf[156]= '0';
+  else
+  {
+    buf[156]= 'S';
+    char *h= &buf[386];
+    if (n_chunks > 4)
+      return -1; // FIXME; support more chunks
+    for (size_t i= 0; i < n_chunks; i++, h+= 24)
+    {
+      ustar_write_dozen(h, chunks[i].offset);
+      ustar_write_dozen(h + 12, chunks[i].length);
+    }
+    ustar_write_dozen(&buf[0x1e3], chunks[n_chunks - 1].offset +
+                      chunks[n_chunks - 1].length);
+  }
+  ustar_block_checksum(buf);
+  return backup_stream_write(stream, buf, sizeof buf);
+}
+
+/** Append to the configuration file.
+@param target   backup stream
+@param config   the configuration file snippet to append
+@param size     length of the snippet
+@return error code (non-positive)
+@retval 0   on success */
+extern "C" int backup_stream_config(IF_WIN(HANDLE, int) stream,
+                                    const char *config, size_t size)
+{
+  /* FIXME: append to a pre-created configuration file */
+  if (int ret=
+      backup_stream_start(stream, "backup.cnf", 0644, size, nullptr, 0))
+    return ret;
+  char buf[512];
+  const size_t whole{size & ~((sizeof buf) - 1)};
+  if (whole)
+    if (int err= backup_stream_write(stream, config, whole))
+      return err;
+  if (size == whole)
+    return 0;
+  ustar_zeropad(buf, config + whole, sizeof buf);
+  return backup_stream_write(stream, buf, sizeof buf);
+}
+
+/**
+   Append a file snippet to stream,
+   after a corresponding call to backup_stream_start().
+
+   Note that tar uses 512-byte blocks. If end-start is not a multiple of
+   512 bytes, backup_stream_write() must be invoked to zero-pad the output.
+   @param src      source file
+   @param stream   backup stream
+   @param start first offset to copy
+   @param end   last offset to copy (exclusive)
+   @return error code (non-positive)
+   @retval 0   on success
+*/
+extern "C" int backup_stream_append(IF_WIN(const native_file_handle&,int) src,
+                                    IF_WIN(HANDLE, int) stream,
+                                    uint64_t start, uint64_t end)
+{
+  assert(stream != backup_sink::NO_STREAM);
+  ssize_t ret;
+#ifndef _WIN32
+  if ((ret= mmap_copy<true>(src, stream, start, end)) == 1)
+#endif
+    ret= pread_write<true>(src, stream, start, end);
+  return int(ret);
+}
+
+#ifdef __linux__
+# include <sys/sendfile.h>
+/** Copy a file to a stream or to a regular file. */
+static inline ssize_t
+send_step(int in_fd, int out_fd, size_t count, off_t *offset) noexcept
+{
+  return sendfile(out_fd, in_fd, offset, count);
+}
+
+/**
+   Append an immutable snippet of a file to the stream,
+   allowing Linux sendfile(2) to be invoked.
+
+   Note that tar uses 512-byte blocks. If end-start is not a multiple of
+   512 bytes, backup_stream_write() must be invoked to zero-pad the output.
+   @param src    source file
+   @param stream backup stream
+   @param start  first offset to copy
+   @param end    last offset to copy (exclusive)
+   @return error code (non-positive)
+   @retval 0   on success
+*/
+extern "C" int backup_stream_append_async(int src, int stream,
+                                          uint64_t start, uint64_t end)
+{
+  assert(stream != backup_sink::NO_STREAM);
+  return int(copy<send_step,true>(src, stream, off_t(start), off_t(end)));
+}
+#endif
+
+#ifdef _WIN32
+extern "C" int backup_stream_append_plain(HANDLE src, HANDLE stream,
+                                          uint64_t start, uint64_t end)
+{
+  return backup_stream_append(src, stream, start, end);
+}
+#endif
diff --git a/sql/sql_backup.h b/sql/sql_backup.h
new file mode 100644
index 0000000000000..2759e0d64b43d
--- /dev/null
+++ b/sql/sql_backup.h
@@ -0,0 +1,53 @@
+/*****************************************************************************
+Copyright (c) 2026 MariaDB plc.
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
+
+*****************************************************************************/
+
+#pragma once
+
+/** BACKUP SERVER */
+class Sql_cmd_backup : public Sql_cmd
+{
+  /** target directory, or nullptr when streaming */
+  const char *const target{nullptr};
+  /** argument of my_popen() for streaming backup, or nullptr */
+  const char *const command{nullptr};
+  /** number of concurrent threads to use */
+  const int threads;
+
+public:
+  /**
+     Constructor.
+     @param target   name of target or scratch directory
+     @param threads  number of concurrent threads to use
+  */
+  Sql_cmd_backup(LEX_CSTRING target, int threads) :
+    target(target.str), threads(threads) {}
+  /**
+     Constructor.
+     @param threads  number of concurrent threads to use
+     @param command  nullptr, or a shell command for handling a backup stream
+  */
+  Sql_cmd_backup(int threads, LEX_CSTRING command) :
+    command(command.str), threads(threads) {}
+  ~Sql_cmd_backup()= default;
+
+  bool execute(THD *thd) override;
+
+  enum_sql_command sql_command_code() const override
+  {
+    return SQLCOM_BACKUP_SERVER;
+  }
+};
diff --git a/sql/sql_backup_interface.h b/sql/sql_backup_interface.h
new file mode 100644
index 0000000000000..94892ba7591ab
--- /dev/null
+++ b/sql/sql_backup_interface.h
@@ -0,0 +1,178 @@
+/* Copyright (c) 2026, MariaDB plc
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+struct backup_target;
+
+/** A payload chunk in a sparse file that is being streamed */
+struct backup_chunk
+{
+  /** byte offset of the start of the payload, from the start of the file */
+  uint64_t offset;
+  /** length of the hole */
+  uint64_t length;
+};
+
+#ifdef _WIN32
+/* Use CopyFileEx() to copy entire files */
+struct native_file_handle;
+#elif defined __APPLE__
+/* You should invoke fclonefileat(2) manually before attempting
+copy_entire_file() or copy_file() */
+# include <sys/attr.h>
+# include <sys/clonefile.h>
+# include <copyfile.h>
+/** Copy an entire file.
+@param src  source file descriptor
+@param dst  target to append src to
+@return error code (negative)
+@retval 0   on success */
+inline int copy_entire_file(int src, int dst)
+{
+  return fcopyfile(src, dst, NULL, COPYFILE_ALL | COPYFILE_CLONE);
+}
+#else
+# ifdef __cplusplus
+extern "C"
+# endif
+/** Copy an entire file.
+@param src  source file descriptor
+@param dst  target to append src to
+@return error code (non-positive)
+@retval 0   on success */
+int copy_entire_file(int src, int dst);
+#endif
+
+#ifdef __cplusplus
+extern "C"
+#endif
+/** Copy a portion of a file.
+@param src   source file descriptor
+@param dst   target to append src to
+@param start first offset to copy
+@param end   last offset to copy (exclusive)
+@return error code (non-positive)
+@retval 0   on success */
+int copy_file(IF_WIN(const native_file_handle&,int) src,
+              IF_WIN(const native_file_handle&,int) dst,
+              uint64_t start, uint64_t end);
+
+#ifdef __cplusplus
+extern "C"
+#endif
+/** Append to the configuration file.
+@param target   backup target directory
+@param config   the configuration file snippet to append
+@param size     length of the snippet
+@return error code (non-positive)
+@retval 0   on success */
+int backup_config_append(IF_WIN(const char*, int) target,
+                         const char *config, size_t size);
+
+#ifdef __cplusplus
+extern "C"
+#endif
+/** Append to the configuration file.
+@param target   backup stream
+@param config   the configuration file snippet to append
+@param size     length of the snippet
+@return error code (non-positive)
+@retval 0   on success */
+int backup_stream_config(IF_WIN(HANDLE, int) stream,
+                         const char *config, size_t size);
+
+#ifdef __cplusplus
+extern "C"
+#endif
+/** Start streaming a file.
+@param target   backup target
+@param name     file name
+@param mode     file access mode
+@param size     physical length of the file, in bytes
+@param chunks   payload chunks of a sparse file, or nullptr
+@param n_chunks number of chunks; 0 unless sparse file
+@return error code (non-positive)
+@retval 0   on success */
+int backup_stream_start(IF_WIN(HANDLE, int) stream,
+                        const char *name, mode_t mode, uint64_t size,
+                        const struct backup_chunk *chunks, size_t n_chunks);
+
+#ifdef __cplusplus
+extern "C"
+#endif
+/**
+   Write data to a stream.
+   @param stream  backup stream
+   @param buf     source buffer
+   @param size    length of the buffer (usually an integer multiple of 512)
+   @return error code (non-positive)
+   @retval 0 on success
+*/
+int backup_stream_write(IF_WIN(HANDLE, int) stream, const void *buf,
+                        size_t size);
+
+#ifdef __cplusplus
+extern "C"
+#endif
+/**
+   Append a file snippet to the stream,
+   after a corresponding call to backup_stream_start().
+
+   Note that tar uses 512-byte blocks. If end-start is not a multiple of
+   512 bytes, backup_stream_write() must be invoked to zero-pad the output.
+   @param src    source file
+   @param stream backup stream
+   @param start  first offset to copy
+   @param end    last offset to copy (exclusive)
+   @return error code (non-positive)
+   @retval 0   on success
+*/
+int backup_stream_append(IF_WIN(const native_file_handle&,int) src,
+                         IF_WIN(HANDLE, int) stream,
+                         uint64_t start, uint64_t end);
+
+#ifdef __linux__
+# ifdef __cplusplus
+extern "C"
+# endif
+/**
+   Append an immutable snippet of a file to the stream,
+   allowing Linux sendfile(2) to be invoked.
+
+   Note that tar uses 512-byte blocks. If end-start is not a multiple of
+   512 bytes, backup_stream_write() must be invoked to zero-pad the output.
+   @param src    source file
+   @param stream backup stream
+   @param start  first offset to copy
+   @param end    last offset to copy (exclusive)
+   @return error code (non-positive)
+   @retval 0   on success
+*/
+int backup_stream_append_async(int src, int stream,
+                               uint64_t start, uint64_t end);
+#elif defined _WIN32
+# define backup_stream_append_async backup_stream_append_plain
+#else
+# define backup_stream_append_async backup_stream_append
+#endif
+
+#ifdef _WIN32
+# ifdef __cplusplus
+extern "C"
+# endif
+int backup_stream_append_plain(HANDLE src, HANDLE stream,
+                               uint64_t start, uint64_t end);
+#else
+# define backup_stream_append_plain backup_stream_append
+#endif
diff --git a/sql/sql_command.h b/sql/sql_command.h
index 9c9166706a034..b8903399711f0 100644
--- a/sql/sql_command.h
+++ b/sql/sql_command.h
@@ -103,6 +103,7 @@ enum enum_sql_command {
   SQLCOM_SHOW_PACKAGE_BODY_CODE,
   SQLCOM_BACKUP, SQLCOM_BACKUP_LOCK,
   SQLCOM_SHOW_CREATE_SERVER,
+  SQLCOM_BACKUP_SERVER,
 
   /*
     When a command is added here, be sure it's also added in mysqld.cc
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index bcd6de564f550..b549017622332 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -781,6 +781,7 @@ void init_update_queries(void)
   sql_command_flags[SQLCOM_DROP_SERVER]|=       CF_AUTO_COMMIT_TRANS;
   sql_command_flags[SQLCOM_BACKUP]=             CF_AUTO_COMMIT_TRANS;
   sql_command_flags[SQLCOM_BACKUP_LOCK]=        CF_AUTO_COMMIT_TRANS;
+  sql_command_flags[SQLCOM_BACKUP_SERVER]=      CF_AUTO_COMMIT_TRANS;
 
   /*
     The following statements can deal with temporary tables,
@@ -5899,6 +5900,7 @@ mysql_execute_command(THD *thd, bool is_called_from_prepared_stmt)
   case SQLCOM_CALL:
   case SQLCOM_REVOKE:
   case SQLCOM_GRANT:
+  case SQLCOM_BACKUP_SERVER:
     if (thd->variables.option_bits & OPTION_IF_EXISTS)
       lex->create_info.set(DDL_options_st::OPT_IF_EXISTS);
     DBUG_ASSERT(lex->m_sql_cmd != NULL);
@@ -10254,7 +10256,7 @@ int test_if_data_home_dir(const char *dir)
   if (!dir)
     DBUG_RETURN(0);
 
-  (void) fn_format(path, dir, "", "", MY_RETURN_REAL_PATH);
+  (void) fn_format(path, dir, "", "", MY_RETURN_REAL_PATH|MY_RESOLVE_SYMLINKS);
   DBUG_RETURN(path_starts_from_data_home_dir(path));
 }
 
diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index b2071b1c50b7f..08bf1fb7d84c8 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -50,6 +50,7 @@
 #include "sql_alter.h"                         // Sql_cmd_alter_table*
 #include "sql_truncate.h"                      // Sql_cmd_truncate_table
 #include "sql_admin.h"                         // Sql_cmd_analyze/Check..._table
+#include "sql_backup.h"
 #include "sql_partition_admin.h"               // Sql_cmd_alter_table_*_part.
 #include "sql_handler.h"                       // Sql_cmd_handler_*
 #include "sql_signal.h"
@@ -1473,7 +1474,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, size_t *yystacksize);
 %type <json_on_response> json_on_response
 
 %type <ulong_num> json_type_constraint
-%type <num> json_key_unique_constraint
+%type <num> json_key_unique_constraint opt_concurrent
 %type <json_predicate> json_predicate
 
 %type <Lex_field_type> field_type field_type_all field_type_all_builtin
@@ -15563,6 +15564,31 @@ backup_statements:
 	    /* Table list is empty for unlock */
             Lex->sql_command= SQLCOM_BACKUP_LOCK;
           }
+        | SERVER_SYM TO_SYM TEXT_STRING_sys opt_concurrent
+          {
+            Lex->sql_command= SQLCOM_BACKUP_SERVER;
+            Lex->m_sql_cmd= new (thd->mem_root) Sql_cmd_backup($3, $4);
+          }
+        | SERVER_SYM WITH opt_concurrent TEXT_STRING_sys
+          {
+            Lex->sql_command= SQLCOM_BACKUP_SERVER;
+            Lex->m_sql_cmd= new (thd->mem_root) Sql_cmd_backup($3, $4);
+          }
+        ;
+
+opt_concurrent:
+        /* empty */
+        { $$= 1; }
+        | ulonglong_num CONCURRENT
+        {
+          $$= int($1);
+          if ($1 < 1 || $1 > 256)
+          {
+            my_error(ER_DATA_OUT_OF_RANGE, myf(0), "CONCURRENT",
+                     "BACKUP SERVER");
+            MYSQL_YYABORT;
+          }
+        }
         ;
 
 opt_delete_gtid_domain:
diff --git a/sql/sys_vars.inl b/sql/sys_vars.inl
index 0f8aa1eb63bf6..8e5f0b984e81e 100644
--- a/sql/sys_vars.inl
+++ b/sql/sys_vars.inl
@@ -2506,6 +2506,7 @@ public:
   bool session_update(THD *thd, set_var *var) override;
 };
 
+#ifdef HAVE_REPLICATION
 /*
   Class for replicate_events_marked_for_skip.
   We need a custom update function that ensures the slave is stopped when
@@ -2647,6 +2648,7 @@ public:
   }
   const uchar *global_value_ptr(THD *thd, const LEX_CSTRING *base) const override;
 };
+#endif /* HAVE_REPLICATION */
 
 
 /**
diff --git a/storage/innobase/CMakeLists.txt b/storage/innobase/CMakeLists.txt
index 9e3a23b34ab46..d63751a16af08 100644
--- a/storage/innobase/CMakeLists.txt
+++ b/storage/innobase/CMakeLists.txt
@@ -185,6 +185,8 @@ SET(INNOBASE_SOURCES
 	handler/handler0alter.cc
 	handler/innodb_binlog.cc
 	handler/i_s.cc
+	handler/backup_innodb.h
+	handler/backup_innodb.cc
 	ibuf/ibuf0ibuf.cc
 	include/btr0btr.h
 	include/btr0btr.inl
diff --git a/storage/innobase/buf/buf0flu.cc b/storage/innobase/buf/buf0flu.cc
index 756a8b85d4752..50fb2f69d4a25 100644
--- a/storage/innobase/buf/buf0flu.cc
+++ b/storage/innobase/buf/buf0flu.cc
@@ -35,6 +35,7 @@ Created 11/11/1995 Heikki Tuuri
 #include "buf0buf.h"
 #include "buf0checksum.h"
 #include "buf0dblwr.h"
+#include "backup_innodb.h"
 #include "srv0start.h"
 #include "page0zip.h"
 #include "fil0fil.h"
@@ -1000,6 +1001,13 @@ uint32_t fil_space_t::flush_freed(bool writable) noexcept
   mysql_mutex_assert_not_owner(&buf_pool.flush_list_mutex);
   mysql_mutex_assert_not_owner(&buf_pool.mutex);
 
+  /* Note: There is no need to invoke writing_start() or
+  writing_stop() here, because we are only overwriting freed (garbage)
+  pages. If backup reads a torn page, it will also have copied a
+  corresponding FREE_PAGE record, which would be applied on recovery.
+  Besides, the freed page should never be reachable from other pages
+  that are part of the snapshot. */
+
   const bool punch_hole= chain.start->punch_hole == 1;
   if (!punch_hole && !srv_immediate_scrub_data_uncompressed)
     return 0;
@@ -1275,6 +1283,16 @@ ATTRIBUTE_COLD static size_t buf_flush_LRU_to_withdraw(size_t to_withdraw,
   return to_withdraw;
 }
 
+/** Stop writing to a tablespace.
+@param space   tablespace
+@return nullptr */
+static fil_space_t *writing_stop(fil_space_t *space) noexcept
+{
+  space->writing_stop();
+  space->release();
+  return nullptr;
+}
+
 /** Flush dirty blocks from the end buf_pool.LRU,
 and move clean blocks to buf_pool.free.
 @param max         maximum number of blocks to flush
@@ -1292,6 +1310,7 @@ static void buf_flush_LRU_list_batch(ulint max, flush_counters_t *n,
     ? 0 : buf_pool.flush_neighbors;
   fil_space_t *space= nullptr;
   uint32_t last_space_id= FIL_NULL;
+  uint32_t backup_page_end= 0;
   static_assert(FIL_NULL > SRV_TMP_SPACE_ID, "consistency");
   static_assert(FIL_NULL > SRV_SPACE_ID_UPPER_BOUND, "consistency");
 
@@ -1371,7 +1390,7 @@ static void buf_flush_LRU_list_batch(ulint max, flush_counters_t *n,
           buf_pool.lru_hp.set(bpage);
           mysql_mutex_unlock(&buf_pool.mutex);
           if (space)
-            space->release();
+            writing_stop(space);
           auto p= buf_flush_space(space_id);
           space= p.first;
           last_space_id= space_id;
@@ -1380,6 +1399,10 @@ static void buf_flush_LRU_list_batch(ulint max, flush_counters_t *n,
             mysql_mutex_lock(&buf_pool.mutex);
             goto no_space;
           }
+
+          backup_page_end= space->writing_start()
+            ? space->backup_page_end() : 0;
+
           mysql_mutex_lock(&buf_pool.mutex);
           buf_pool.stat.n_pages_written+= p.second;
         }
@@ -1391,8 +1414,7 @@ static void buf_flush_LRU_list_batch(ulint max, flush_counters_t *n,
       }
       else if (space->is_stopping_writes())
       {
-        space->release();
-        space= nullptr;
+        space= writing_stop(space);
       no_space:
         mysql_mutex_lock(&buf_pool.flush_list_mutex);
         buf_flush_discard_page(bpage);
@@ -1409,7 +1431,8 @@ static void buf_flush_LRU_list_batch(ulint max, flush_counters_t *n,
         break;
       }
 
-      if (neighbors && space->is_rotational() && UNIV_LIKELY(!to_withdraw) &&
+      if (neighbors && UNIV_LIKELY(!(to_withdraw | backup_page_end)) &&
+          space->is_rotational() &&
           /* Skip neighbourhood flush from LRU list if we haven't yet reached
           half of the free page target. */
           UT_LIST_GET_LEN(buf_pool.free) * 2 >= free_limit)
@@ -1421,10 +1444,17 @@ static void buf_flush_LRU_list_batch(ulint max, flush_counters_t *n,
       flush:
         if (UNIV_UNLIKELY(to_withdraw != 0))
           to_withdraw= buf_flush_LRU_to_withdraw(to_withdraw, *bpage);
-        if (bpage->flush(space))
+        const uint32_t page{bpage->id().page_no()};
+        if (page < backup_page_end &&
+            page >= backup_page_end - space->BACKUP_BATCH_SIZE)
+          bpage->lock.u_unlock(true);
+        else if (bpage->flush(space))
+        {
           ++n->flushed;
-        else
-          continue;
+          goto reacquire_mutex;
+        }
+
+        continue;
       }
 
       goto reacquire_mutex;
@@ -1437,7 +1467,7 @@ static void buf_flush_LRU_list_batch(ulint max, flush_counters_t *n,
   buf_pool.lru_hp.set(nullptr);
 
   if (space)
-    space->release();
+    writing_stop(space);
 
   if (scanned)
   {
@@ -1484,6 +1514,7 @@ static ulint buf_do_flush_list_batch(ulint max_n, lsn_t lsn) noexcept
     ? 0 : buf_pool.flush_neighbors;
   fil_space_t *space= nullptr;
   uint32_t last_space_id= FIL_NULL;
+  uint32_t backup_page_end= 0;
   static_assert(FIL_NULL > SRV_TMP_SPACE_ID, "consistency");
   static_assert(FIL_NULL > SRV_SPACE_ID_UPPER_BOUND, "consistency");
 
@@ -1555,10 +1586,12 @@ static ulint buf_do_flush_list_batch(ulint max_n, lsn_t lsn) noexcept
           mysql_mutex_unlock(&buf_pool.flush_list_mutex);
           mysql_mutex_unlock(&buf_pool.mutex);
           if (space)
-            space->release();
+            writing_stop(space);
           auto p= buf_flush_space(space_id);
           space= p.first;
           last_space_id= space_id;
+          backup_page_end= space && space->writing_start()
+            ? space->backup_page_end() : 0;
           mysql_mutex_lock(&buf_pool.mutex);
           buf_pool.stat.n_pages_written+= p.second;
           mysql_mutex_lock(&buf_pool.flush_list_mutex);
@@ -1567,10 +1600,7 @@ static ulint buf_do_flush_list_batch(ulint max_n, lsn_t lsn) noexcept
           ut_ad(!space);
       }
       else if (space->is_stopping_writes())
-      {
-        space->release();
-        space= nullptr;
-      }
+        space= writing_stop(space);
 
       if (!space)
         buf_flush_discard_page(bpage);
@@ -1579,9 +1609,17 @@ static ulint buf_do_flush_list_batch(ulint max_n, lsn_t lsn) noexcept
         mysql_mutex_unlock(&buf_pool.flush_list_mutex);
         do
         {
-          if (neighbors && space->is_rotational())
+          if (neighbors && UNIV_LIKELY(!backup_page_end) &&
+              space->is_rotational())
             count+= buf_flush_try_neighbors(space, page_id, bpage,
                                             neighbors == 1, count, max_n);
+          else if (page_id.page_no() < backup_page_end &&
+                   page_id.page_no() >=
+                   backup_page_end - space->BACKUP_BATCH_SIZE)
+          {
+            bpage->lock.u_unlock(true);
+            continue;
+          }
           else if (bpage->flush(space))
             ++count;
           else
@@ -1600,7 +1638,7 @@ static ulint buf_do_flush_list_batch(ulint max_n, lsn_t lsn) noexcept
   buf_pool.flush_hp.set(nullptr);
 
   if (space)
-    space->release();
+    writing_stop(space);
 
   if (scanned)
   {
@@ -1691,6 +1729,7 @@ bool buf_flush_list_space(fil_space_t *space, ulint *n_flushed) noexcept
     if (written)
       buf_pool.stat.n_pages_written+= written;
   }
+
   mysql_mutex_lock(&buf_pool.flush_list_mutex);
 
   for (buf_page_t *bpage= UT_LIST_GET_LAST(buf_pool.flush_list); bpage; )
@@ -1733,17 +1772,35 @@ bool buf_flush_list_space(fil_space_t *space, ulint *n_flushed) noexcept
           acquired= false;
           goto was_freed;
         }
+
         mysql_mutex_unlock(&buf_pool.flush_list_mutex);
-        if (bpage->flush(space))
+        uint32_t page, backup_page_end;
+
+        if (UNIV_UNLIKELY(space->writing_start()))
         {
-          ++n_flush;
-          if (!--max_n_flush)
+          page= bpage->id().page_no();
+          backup_page_end= space->backup_page_end();
+          if (page < backup_page_end &&
+              page >= backup_page_end - space->BACKUP_BATCH_SIZE)
           {
+            bpage->lock.u_unlock(true);
+            space->writing_stop();
+          skip:
             mysql_mutex_lock(&buf_pool.mutex);
             mysql_mutex_lock(&buf_pool.flush_list_mutex);
             may_have_skipped= true;
             goto done;
           }
+        }
+
+        const bool written{bpage->flush(space)};
+        space->writing_stop();
+
+        if (written)
+        {
+          ++n_flush;
+          if (!--max_n_flush)
+            goto skip;
           mysql_mutex_lock(&buf_pool.mutex);
         }
       }
@@ -2060,6 +2117,7 @@ inline lsn_t log_t::write_checkpoint(lsn_t checkpoint, lsn_t end_lsn) noexcept
   this->end_lsn= end_lsn;
   if (!archive)
   {
+    archived_checkpoint= checkpoint;
     archived_lsn= end_lsn;
   checkpoint_completed:
     if (resize_log.m_file == log.m_file)
@@ -2077,7 +2135,7 @@ inline lsn_t log_t::write_checkpoint(lsn_t checkpoint, lsn_t end_lsn) noexcept
     /* Make the previous archived log file read-only */
 #ifdef _WIN32
     resize_log.close();
-    SetFileAttributesA(get_archive_path().c_str(),
+    SetFileAttributesA(get_archive_path(get_first_lsn() - capacity()).c_str(),
                        FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_ARCHIVE);
 #else
     struct stat st;
@@ -2087,9 +2145,10 @@ inline lsn_t log_t::write_checkpoint(lsn_t checkpoint, lsn_t end_lsn) noexcept
       st.st_mode= 0444;
     if (fchmod(resize_log.m_file, st.st_mode))
       my_error(ER_ERROR_ON_CLOSE, MYF(ME_ERROR_LOG),
-               get_archive_path().c_str(), errno);
+               get_archive_path(get_first_lsn() - capacity()).c_str(), errno);
     resize_log.close();
 #endif
+    innodb_backup_checkpoint();
   }
   else
     goto checkpoint_completed;
diff --git a/storage/innobase/dict/dict0load.cc b/storage/innobase/dict/dict0load.cc
index d8976dec66974..fe221f72f0873 100644
--- a/storage/innobase/dict/dict0load.cc
+++ b/storage/innobase/dict/dict0load.cc
@@ -889,6 +889,10 @@ void dict_load_tablespaces(const std::set<uint32_t> *spaces, bool upgrade)
 
 	dict_sys.lock(SRW_LOCK_CALL);
 
+	if (fil_system.have_all_spaces) {
+		goto done;
+	}
+
 	if (!spaces && !upgrade
 	    && !encryption_key_id_exists(FIL_DEFAULT_ENCRYPTION_KEY)) {
 		max_space_id = dict_find_max_space_id(&pcur, &mtr);
@@ -985,6 +989,7 @@ void dict_load_tablespaces(const std::set<uint32_t> *spaces, bool upgrade)
 		ut_free(filepath);
 	}
 
+	fil_system.have_all_spaces = true;
 done:
 	mtr.commit();
 
diff --git a/storage/innobase/handler/backup_innodb.cc b/storage/innobase/handler/backup_innodb.cc
new file mode 100644
index 0000000000000..b658778b5bd89
--- /dev/null
+++ b/storage/innobase/handler/backup_innodb.cc
@@ -0,0 +1,1193 @@
+/* Copyright (c) 2026, MariaDB plc
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+#include "my_global.h"
+#include "sql_class.h"
+#include "backup_innodb.h"
+#include "sql_backup_interface.h"
+#include "trx0trx.h"
+#include "buf0flu.h"
+#include "log0crypt.h"
+#include "dict0load.h"
+#include <vector>
+#ifdef __linux__
+# include <fcntl.h>
+# include <linux/falloc.h>
+#endif
+
+/** Associate a transaction with the current session
+@param thd   session
+@return InnoDB transaction */
+trx_t *check_trx_exists(THD *thd) noexcept;
+
+namespace
+{
+/** Backup state; protected by log_sys.latch */
+class InnoDB_backup
+{
+  /** Backup context */
+  struct context
+  {
+    /** Start LSN of the first backed up log file */
+    lsn_t first_lsn;
+    /** Start LSN of the last log file, or LSN_MAX if not determined yet */
+    lsn_t max_first_lsn;
+    /** Final LSN of the backup, or LSN_MAX if not determined yet */
+    lsn_t last_lsn;
+    /** size of the first log file */
+    uint64_t first_size;
+    /** Checkpoint at the start of the backup */
+    lsn_t checkpoint;
+    /** Log record pointing to the checkpoint */
+    lsn_t checkpoint_end_lsn;
+    /** the original state of innodb_log_archive before/after backup */
+    bool archived;
+    /** whether end() was invoked */
+    bool cleaned_up;
+    /** the start LSN of the last hard-linked file, or 0 */
+    std::atomic<lsn_t> last_hardlink;
+
+    /**
+       Note that a log file was hard-linked.
+       @param lsn   start LSN of a hard-linked file
+    */
+    void note_hardlink(lsn_t lsn) noexcept
+    {
+      for (lsn_t last= last_hardlink.load(std::memory_order_relaxed);
+           last < lsn && !last_hardlink.
+             compare_exchange_weak(last, lsn,
+                                   std::memory_order_relaxed,
+                                   std::memory_order_relaxed); ) {}
+    }
+
+    /** Ensure that the last, hard-linked log file is not shared with
+    the server data directory, by copying it until the final LSN
+    @param target    backup target directory
+    @param hl        last_hardlink
+    @return error code
+    @retval 0 on success
+    */
+    ATTRIBUTE_COLD int de_hardlink(const backup_target &target, lsn_t hl)
+      noexcept
+    {
+#ifdef _WIN32
+      std::string src{target.path};
+      src.push_back('/');
+      std::string dst{src};
+      src.append("ib_logfile101");
+      log_sys.append_archive_name(dst, hl);
+      const char *const s_{src.c_str()}, *const d_{dst.c_str()};
+      if (!MoveFileEx(d_, s_, 0))
+      {
+        my_osmaperr(GetLastError());
+        my_error(ER_ERROR_ON_RENAME, MYF(ME_ERROR_LOG), d_, s_, errno);
+        return 1;
+      }
+      HANDLE s, d;
+      for (;;)
+      {
+        s= CreateFile(s_, GENERIC_READ,
+                      FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                      my_win_file_secattr(), OPEN_EXISTING,
+                      FILE_ATTRIBUTE_NORMAL, nullptr);
+        if (s != INVALID_HANDLE_VALUE)
+          break;
+        switch (GetLastError()) {
+        case ERROR_SHARING_VIOLATION:
+        case ERROR_LOCK_VIOLATION:
+          std::this_thread::sleep_for(std::chrono::seconds(1));
+          continue;
+        }
+        my_osmaperr(GetLastError());
+        my_error(ER_FILE_NOT_FOUND, MYF(ME_ERROR_LOG), s_, errno);
+        return 1;
+      }
+      d= CreateFile(d_, GENERIC_WRITE, 0, my_win_file_secattr(),
+                    CREATE_NEW, FILE_ATTRIBUTE_NORMAL, nullptr);
+      if (d == INVALID_HANDLE_VALUE)
+      {
+      error_return:
+        my_osmaperr(GetLastError());
+        std::ignore= CloseHandle(s);
+        my_error(ER_ERROR_ON_RENAME, MYF(ME_ERROR_LOG), s_, d_, errno);
+        return 1;
+      }
+#else
+      std::string dst;
+      log_sys.append_archive_name(dst, hl);
+      const char *const d_{dst.c_str()};
+      int d{-1};
+      int err= ER_FILE_NOT_FOUND;
+      int s= openat(target.fd, d_, O_RDONLY);
+      if (s == -1)
+      {
+      error_return:
+        my_error(err, MYF(ME_ERROR_LOG), d_, errno);
+        if (s != -1)
+          std::ignore= close(s);
+        return 1;
+      }
+      err= ER_CANT_DELETE_FILE;
+      if (unlinkat(target.fd, d_, 0))
+        goto error_return;
+      err= ER_CANT_CREATE_FILE;
+      d= openat(target.fd, d_, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0666);
+      if (d < 0)
+        goto error_return;
+#endif
+      const uint64_t end{log_sys.START_OFFSET + last_lsn - hl};
+      /* First, extend the file to a valid size. */
+#ifdef _WIN32
+      int f;
+      {
+        LARGE_INTEGER li;
+        li.QuadPart= std::max<uint64_t>(log_sys.FILE_SIZE_MIN,
+                                        (end + 4095) & ~4095ULL);
+        f= !SetFilePointerEx(d, li, nullptr, FILE_BEGIN) || !SetEndOfFile(d);
+      }
+#else
+      int f=
+        ftruncate(d, std::max<off_t>(log_sys.FILE_SIZE_MIN,
+                                     (end + 4095) & ~4095LL));
+#endif
+      if (!f &&
+          !(f= copy_file(s, d, log_sys.START_OFFSET +
+                         (hl == first_lsn) * (checkpoint - hl), end)) &&
+          hl == first_lsn)
+      {
+        uint64_t cp_buf[8]{};
+        write_checkpoint_buf(cp_buf,
+                             checkpoint_end_lsn - hl + log_sys.START_OFFSET);
+        f= write_checkpoint(d, cp_buf);
+      }
+      if (IF_WIN(!CloseHandle(d), close(d)) | f)
+        goto error_return;
+      std::ignore= IF_WIN(CloseHandle(s), close(s));
+#ifdef _WIN32
+      if (!DeleteFile(s_))
+      {
+        my_osmaperr(GetLastError());
+        my_error(ER_CANT_DELETE_FILE, MYF(ME_ERROR_LOG), s_, errno);
+        return 1;
+      }
+#endif
+      return 0;
+    }
+
+    /**
+       Finish a backup.
+       @param target  backup target
+       @param sink    backup worker context
+       @return error code
+       @retval 0 on success
+    */
+    int cleanup(const backup_target &target, const backup_sink &sink) noexcept
+    {
+      const lsn_t hl{last_hardlink.load(std::memory_order_relaxed)};
+      if (hl == LSN_MAX)
+        return 0;
+      log_sys.latch.rd_lock();
+      const lsn_t current_first_lsn{log_sys.get_first_lsn()};
+      log_sys.latch.rd_unlock();
+      if (hl == current_first_lsn)
+      {
+        ut_ad(sink.stream == sink.NO_STREAM);
+        if (int fail= de_hardlink(target, hl))
+          return fail;
+      }
+      return write_config(target, sink);
+    }
+  };
+
+  /** pointer to backup context, or nullptr if no backup is active */
+  context *ctx;
+
+  /** the original innodb_log_file_size, or 0 */
+  uint64_t old_size;
+
+  /** collection of files and sizes to be copied */
+  std::vector<uint64_t> queue;
+  /** collection of completed log archive files to be
+  hard-linked, copied, or moved */
+  std::vector<lsn_t> logs;
+
+public:
+  /**
+     Start of BACKUP SERVER: collect all files to be backed up
+     @param thd     current session
+     @return ctx
+     @retval -1 on failure
+  */
+  void *init(THD *thd) noexcept
+  {
+    log_sys.latch.wr_lock();
+    ut_ad(!ctx);
+    ut_ad(queue.empty());
+    if (!logs.empty())
+    {
+      /* A new BACKUP SERVER is being invoked before a previous one
+      had been fully finalized. Clean up any log files. */
+      delete_logs();
+      logs.clear();
+    }
+
+    const bool fail{log_sys.backup_start(&old_size, thd)};
+
+    if (!fail)
+    {
+      lsn_t start_end;
+      const lsn_t start=
+#if 1 /* TODO: for incremental backup, allow the start to be specified */
+        log_sys.get_latest_checkpoint(start_end);
+#else
+        log_sys.archived_checkpoint;
+      start_end= log_sys.archived_lsn;
+#endif
+      ctx= new context{
+        log_sys.get_first_lsn(), LSN_MAX, LSN_MAX, log_sys.file_size,
+        start, start_end, !old_size, false, 0
+      };
+
+      /* Collect all tablespaces that have been created before our
+      start checkpoint. Newer tablespaces will be recovered by the
+      innodb_log_archive=ON recovery.
+
+      If a tablespace is deleted before step() is invoked, the file
+      will not be copied, and a FILE_DELETE record in the log will
+      ensure correct recovery.
+
+      If a tablespace is renamed between this and end(), the recovery
+      of a FILE_RENAME record will ensure the correct file name,
+      no matter which name was used by step(). */
+      mysql_mutex_lock(&fil_system.mutex);
+      for (fil_space_t &space : fil_system.space_list)
+        if (space.id < SRV_SPACE_ID_UPPER_BOUND &&
+            !space.is_being_imported() &&
+            /* FIXME: how to initialize create_lsn for old files, to
+            have efficient incremental backup?
+            fil_node_t::read_page0() cannot assign it from
+            FIL_PAGE_LSN because that would not reflect the file
+            creation but for example allocating or freeing a page.
+
+            The easy parts of initializing space->create_lsn are
+            as follows:
+            (1) In log_parse_file() when processing FILE_CREATE
+            (2) In deferred_spaces.create() */
+            space.get_create_lsn() < start)
+          queue.emplace_back
+            (uint64_t{std::min(space.size, space.free_limit)} << 32 |
+             space.id);
+      mysql_mutex_unlock(&fil_system.mutex);
+    }
+    log_sys.latch.wr_unlock();
+    DEBUG_SYNC(thd, "innodb_backup_start");
+    return fail ? reinterpret_cast<void*>(-1) : ctx;
+  }
+
+  /**
+     Process a file that was collected at init().
+     This may be invoked from multiple concurrent threads.
+     @param target  backup target
+     @param phase   backup phase
+     @param sink    backup worker context
+     @return number of files remaining, or negative on error
+     @retval 0 on completion
+  */
+  int step(const backup_target &target, backup_phase phase,
+           const backup_sink &sink) noexcept
+  {
+    uint64_t id_limit{0};
+    lsn_t lsn{0};
+    log_sys.latch.wr_lock();
+    const lsn_t first{log_sys.get_first_lsn()};
+    ut_ad(sink.ha_data);
+    ut_ad(ctx ? ctx == sink.ha_data
+          : phase == BACKUP_PHASE_FINISH || phase == BACKUP_PHASE_NO_COMMIT);
+    ut_ad(static_cast<context*>(sink.ha_data)->last_lsn == LSN_MAX
+          ? phase == BACKUP_PHASE_START : !ctx);
+    size_t size{queue.size()};
+    ut_ad(!size || phase == BACKUP_PHASE_START);
+    if (!logs.empty())
+    {
+      lsn= logs.back();
+      logs.pop_back();
+      if (!size)
+        size= logs.size();
+    }
+    else if (size)
+    {
+      ut_ad(phase == BACKUP_PHASE_START);
+      size--;
+      id_limit= queue.back();
+      queue.pop_back();
+    }
+    log_sys.latch.wr_unlock();
+
+    if (lsn)
+    {
+      if (UNIV_UNLIKELY(lsn > first))
+        /* Wait for checkpoint_complete(). */
+        buf_flush_sync_batch(lsn, true);
+      if (replicate(lsn, target, sink, lsn < first))
+        return -1;
+    }
+    else if (!id_limit);
+    else if (fil_space_t *space= fil_space_t::get(uint32_t(id_limit)))
+    {
+      int res= -1;
+      uint32_t start{0}, limit{uint32_t(id_limit >> 32)};
+#ifdef _WIN32
+      if (sink.stream == sink.NO_STREAM)
+      {
+        for (fil_node_t *node= UT_LIST_GET_FIRST(space->chain);;)
+        {
+          if ((res= backup(target.path, node, start, limit)))
+            break;
+          fil_node_t *next= UT_LIST_GET_NEXT(chain, node);
+          if (!next)
+            break;
+          const uint32_t size{node->size};
+          start+= size;
+          if (limit >= size)
+            limit-= size;
+          else
+            limit= 0;
+          node= next;
+        }
+      }
+      else
+      {
+        for (fil_node_t *node= UT_LIST_GET_FIRST(space->chain);;)
+        {
+          if ((res= stream(sink.stream, node, start, limit)))
+            break;
+          fil_node_t *next= UT_LIST_GET_NEXT(chain, node);
+          if (!next)
+            break;
+          const uint32_t size{node->size};
+          start+= size;
+          if (limit >= size)
+            limit-= size;
+          else
+            limit= 0;
+          node= next;
+        }
+      }
+#else
+      int fd;
+      int (*method)(int, fil_node_t *, uint32_t, uint32_t);
+      if (sink.stream == sink.NO_STREAM)
+      {
+        fd= target.fd;
+        method= backup;
+      }
+      else
+      {
+        fd= sink.stream;
+        method= stream;
+      }
+      for (fil_node_t *node= UT_LIST_GET_FIRST(space->chain);;)
+      {
+        if ((res= (*method)(fd, node, start, limit)))
+          break;
+        fil_node_t *next= UT_LIST_GET_NEXT(chain, node);
+        if (!next)
+          break;
+        const uint32_t size{node->size};
+        start+= size;
+        if (limit >= size)
+          limit-= size;
+        else
+          limit= 0;
+        node= next;
+      }
+#endif
+      space->release();
+      if (res)
+        return res;
+    }
+
+    size= std::min(size_t{std::numeric_limits<int>::max()}, size);
+    return int(size);
+  }
+
+  /**
+     Determine the logical time of the backup snapshot.
+  */
+  void commit() noexcept
+  {
+    log_sys.latch.wr_lock();
+    ut_ad(queue.empty());
+    ut_ad(ctx);
+    ut_ad(ctx->last_lsn == LSN_MAX);
+    const lsn_t last_lsn{log_sys.get_lsn()};
+    lsn_t lsn{log_sys.get_first_lsn()};
+    if (logs.empty() || logs.back() != lsn)
+    {
+      /* Schedule the remaining log for copying */
+      logs.emplace_back(lsn);
+      const lsn_t next_lsn{lsn + log_sys.capacity()};
+      if (next_lsn < last_lsn)
+        logs.emplace_back(lsn= next_lsn);
+    }
+    ctx->max_first_lsn= lsn;
+    ctx->last_lsn= last_lsn;
+    ctx= nullptr; /* unsubscribe to checkpoint_complete() */
+    log_sys.latch.wr_unlock();
+  }
+
+  /**
+     Finish copying or finalize the backup.
+     @param thd     current session
+     @param phase   backup phase
+     @param sink    backup worker context
+     @return error code
+     @retval 0 on success
+  */
+  int end(THD *thd, backup_phase phase, const backup_sink &sink) noexcept
+  {
+    context *const ctx{static_cast<context*>(sink.ha_data)};
+    if (!ctx /* InnoDB_backup::init() must have failed */ ||
+        ctx->cleaned_up /* aborting after phase=BACKUP_PHASE_NO_COMMIT */)
+      return 0;
+    ctx->cleaned_up= true;
+    if (phase == BACKUP_PHASE_ABORT)
+      ctx->last_hardlink.store(LSN_MAX, std::memory_order_relaxed);
+    log_sys.latch.wr_lock();
+    ut_ad(!this->ctx || this->ctx == ctx);
+    this->ctx= nullptr; /* fini() will delete the object */
+    ut_ad(!log_sys.resize_in_progress());
+    ut_ad(log_sys.archive);
+    queue.clear();
+    int fail{0};
+    if (!old_size)
+      logs.clear();
+    else
+    {
+      delete_logs();
+      logs.clear();
+      log_sys.latch.wr_unlock();
+      fail= log_sys.backup_stop_archiving(thd);
+      log_sys.latch.wr_lock();
+    }
+
+    log_sys.backup_stop(old_size, thd);
+    return fail;
+  }
+
+  /**
+     Clean up after end().
+     @param target  backup target
+     @param sink    backup worker context
+     @return error code
+     @retval 0 on success
+  */
+  int fini(const backup_target &target, const backup_sink &sink) noexcept
+  {
+    if (context *ctx{static_cast<context*>(sink.ha_data)})
+    {
+      ut_ad(ctx != this->ctx);
+      int fail{ctx->cleanup(target, sink)};
+      delete ctx;
+      return fail;
+    }
+    return 0;
+  }
+
+  /**
+     Complete the first checkpoint in a new archive log file.
+  */
+  void checkpoint_complete() noexcept
+  {
+    ut_ad(log_sys.latch_have_wr());
+    if (ctx)
+      logs.emplace_back(log_sys.get_first_lsn() - log_sys.capacity());
+  }
+
+private:
+  /** Safely start backing up a tablespace file
+  @param end  last page to copy */
+  static void backup_batch_start(fil_space_t *space, uint32_t end) noexcept
+  {
+    if (space->backup_start(end))
+      os_aio_wait_until_no_pending_writes(false);
+  }
+  /* Stop backing up a tablespace */
+  static void backup_batch_stop(fil_space_t *space) noexcept
+  { space->backup_stop(); }
+
+  /**
+     Delete unnecessary logs that had been created for backup.
+  */
+  void delete_logs() noexcept
+  {
+    ut_ad(log_sys.latch_have_wr());
+    ut_ad(old_size);
+    const lsn_t first_lsn{log_sys.get_first_lsn()};
+    for (const lsn_t lsn : logs)
+      if (lsn != first_lsn)
+        IF_WIN(DeleteFile,unlink)(log_sys.get_archive_path(lsn).c_str());
+  }
+
+  /**
+     Back up a persistent InnoDB data file.
+     @param target backup target directory
+     @param node   InnoDB data file
+     @param start  the page number at the start of the file
+     @param limit  the size of the file at the start of backup
+     @return error code (non-positive)
+     @retval 0 on success
+  */
+  static int backup(IF_WIN(const char *,int) target, fil_node_t *node,
+                    uint32_t start, uint32_t limit) noexcept
+  {
+    for (bool tried_mkdir{false};;)
+    {
+#ifdef _WIN32
+      std::string path{target};
+      path.push_back('/');
+      path.append(node->name);
+      HANDLE f= CreateFile(path.c_str(), GENERIC_WRITE, 0,
+                           my_win_file_secattr(), CREATE_NEW,
+                           FILE_ATTRIBUTE_NORMAL, nullptr);
+      if (f == INVALID_HANDLE_VALUE)
+      {
+        unsigned long err= GetLastError();
+        if (err == ERROR_PATH_NOT_FOUND && !tried_mkdir &&
+            node->space->id && !srv_is_undo_tablespace(node->space->id))
+        {
+          tried_mkdir= true;
+          path.erase(path.rfind('/'));
+          if (CreateDirectory(path.c_str(),
+                              my_dir_security_attributes.lpSecurityDescriptor
+                              ? &my_dir_security_attributes : nullptr) ||
+              (err= GetLastError()) == ERROR_ALREADY_EXISTS)
+            continue;
+        }
+
+        my_osmaperr(err);
+        goto fail;
+      }
+#else
+      int f;
+# ifdef __APPLE__
+      /* aio::synchronous() in another thread may concurrently invoke
+      pwrite(2) on node->handle. We assume that both pwrite(2) and
+      fclonefileat(2) are atomic with respect to each other. Should
+      this assumption be invalid, some data files in the backup may be
+      corrupted. This corruption can be fixed by either removing this
+      special handling, or by implementing file-level locking. */
+      f= fclonefileat(node->handle, target, node->name, 0);
+      if (!f)
+        break;
+      switch (errno) {
+      case ENOENT:
+        goto try_mkdir;
+      case ENOTSUP:
+        break;
+      default:
+        goto fail;
+      }
+# endif
+      f= openat(target, node->name,
+                O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0666);
+      if (f < 0)
+      {
+        if (errno == ENOENT)
+        {
+# ifdef __APPLE__
+        try_mkdir:
+# endif
+          if (!tried_mkdir && node->space->id &&
+              !srv_is_undo_tablespace(node->space->id))
+          {
+            tried_mkdir= true;
+            const char *sep= strchr(node->name, '/');
+            ut_ad(sep);
+            sep= strchr(sep + 1, '/');
+            ut_ad(sep);
+            std::string dir{node->name, size_t(sep - node->name)};
+            if (!mkdirat(target, dir.c_str(), 0777) || errno == EEXIST)
+              continue;
+          }
+        }
+        goto fail;
+      }
+#endif
+      const uint32_t page_size{node->space->physical_size()};
+      int err{0};
+
+      if (node->size > limit)
+      {
+        /* Expand the file to its logical size. */
+#ifdef _WIN32
+        LARGE_INTEGER li;
+        li.QuadPart= uint64_t{node->size} * page_size;
+        err= !SetFilePointerEx(f, li, nullptr, FILE_BEGIN) || !SetEndOfFile(f);
+#else
+        err= ftruncate(f, uint64_t{node->size} * page_size);
+#endif
+        if (err)
+          limit= 0;
+      }
+      else if (node->size < limit)
+        limit= node->size;
+
+      for (uint32_t page{0}; page < limit; )
+      {
+        {
+          const uint32_t end{start + fil_space_t::BACKUP_BATCH_SIZE};
+          backup_batch_start(node->space, end);
+          start= end;
+        }
+        uint32_t last{std::min(limit, page + fil_space_t::BACKUP_BATCH_SIZE)};
+        /* TODO: avoid copying freed page ranges, or pages that were
+        allocated after the backup started */
+        err= copy_file(node->handle, f, uint64_t{page} * page_size,
+                       uint64_t{last} * page_size);
+        page= last;
+        backup_batch_stop(node->space);
+        if (err)
+          break;
+      }
+
+      if (IF_WIN(!CloseHandle(f), close(f)) | err)
+        goto fail;
+      break;
+    }
+    return 0;
+  fail:
+    my_error(ER_CANT_CREATE_FILE, MYF(0), node->name, errno);
+    return -1;
+  }
+
+  /**
+     Stream a persistent InnoDB data file.
+     @param stream backup target stream
+     @param node   InnoDB data file
+     @param start  the page number at the start of the file
+     @param limit  the size of the file at the start of backup
+     @return error code (non-positive)
+     @retval 0 on success
+  */
+  static int stream(IF_WIN(HANDLE,int) stream, fil_node_t *node,
+                    uint32_t start, uint32_t limit) noexcept
+  {
+    const uint32_t file_size{node->size},
+      page_size{node->space->physical_size()};
+    backup_chunk chunk[2]{
+      {0, uint64_t{limit} * page_size},
+      {uint64_t{file_size} * page_size, 0}
+    };
+    if (file_size < limit)
+    {
+      limit= file_size;
+      chunk[0].length= chunk[1].offset;
+    }
+    int err= backup_stream_start(stream, node->name, 0644,
+                                 chunk[0].length,
+                                 chunk, (file_size > limit) * 2);
+    if (err)
+      limit= 0;
+
+    for (uint32_t page{0}; page < limit; )
+    {
+      {
+        const uint32_t end{start + fil_space_t::BACKUP_BATCH_SIZE};
+        backup_batch_start(node->space, end);
+        start= end;
+      }
+      uint32_t last{std::min(limit, page + fil_space_t::BACKUP_BATCH_SIZE)};
+      /* TODO: avoid copying freed page ranges, or pages that were
+      allocated after the backup started */
+      err= backup_stream_append(node->handle, stream,
+                                uint64_t{page} * page_size,
+                                uint64_t{last} * page_size);
+      page= last;
+      backup_batch_stop(node->space);
+      if (err)
+        break;
+    }
+
+    if (err)
+      my_error(ER_IO_WRITE_ERROR, MYF(0), errno, strerror(errno),
+               "BACKUP SERVER");
+    return err;
+  }
+
+private:
+  /**
+     Initialize a checkpoint header buffer pointing to the start of the backup.
+     @param buf   checkpoint buffer
+     @param c     offset of the FILE_CHECKPOINT mini-transaction
+  */
+  static void write_checkpoint_buf(uint64_t *buf, uint64_t c) noexcept
+  {
+    ut_ad(c >= log_sys.START_OFFSET);
+    if (log_sys.is_encrypted())
+      log_crypt_write_header(reinterpret_cast<byte*>(buf), true);
+    buf[4 * log_sys.is_encrypted()]= my_htobe64(c);
+  }
+
+  /** Write a checkpoint header pointing to the start of the backup.
+  @param dst       target file
+  @param buf       checkpoint header
+  @return error code
+  @retval 0 on success */
+  static int write_checkpoint(IF_WIN(HANDLE,int) dst, const void *buf) noexcept
+  {
+#ifdef _WIN32
+    using tpool::pwrite;
+#endif
+    for (ssize_t o= 0, count= 64; count;)
+    {
+      ssize_t ret=
+        pwrite(dst, static_cast<const char*>(buf) + o, count, o);
+      if (ret <= 0 || ret > count)
+        return -1;
+      o+= ret;
+      count-= ret;
+    }
+    return 0;
+  }
+
+public:
+  /** Maximum length of the configuration string */
+  static constexpr size_t CONFIG_SIZE=
+    sizeof "[server]\n# checkpoint=" +
+    sizeof "innodb_log_recovery_start=" +
+    sizeof "innodb_log_recovery_target=\n" + 45 * 3;
+
+  /** Write the configuration parameters for restoring the backup
+  @param config  buffer for configuration string
+  @param ctx     backup context
+  @return size of the configuration string */
+  static size_t write_config_buf(char *config, const context &ctx)
+    noexcept
+  {
+    ut_ad(ctx.last_lsn != LSN_MAX);
+    return size_t(snprintf(config, CONFIG_SIZE,
+                           "[server]\n# checkpoint=" LSN_PF "\n"
+                           "innodb_log_recovery_start=" LSN_PF "\n"
+                           "innodb_log_recovery_target=" LSN_PF "\n",
+                           ctx.checkpoint, ctx.checkpoint_end_lsn,
+                           ctx.last_lsn));
+  }
+
+  /** Write the configuration parameters for restoring the backup
+  @param target  backup target
+  @param sink    backup worker context
+  @param ctx     backup context
+  @return error code (non-positive)
+  @retval 0   on success */
+  static int write_config(const backup_target &target,
+                          const backup_sink &sink) noexcept
+  {
+    char config[CONFIG_SIZE];
+    const size_t size
+      {write_config_buf(config, *static_cast<context*>(sink.ha_data))};
+    return sink.stream == sink.NO_STREAM
+      ? backup_config_append(IF_WIN(target.path, target.fd), config, size)
+      : backup_stream_config(sink.stream, config, size);
+  }
+
+  /**
+     Hard-link (copy) or rename (move) or stream an archive log file.
+     @param lsn       The first LSN in the file
+     @param target    backup target
+     @param sink      backup context
+     @param old       lsn < log_sys.get_first_lsn()
+     @return error code
+     @retval 0 on success
+  */
+  static int replicate(lsn_t lsn,
+                       const backup_target &target,
+                       const backup_sink &sink, bool old) noexcept
+  {
+    ut_ad(log_get_lsn() >= lsn);
+    const std::string p{log_sys.get_archive_path(lsn)};
+    const char *const path= p.c_str(), *basename= strrchr(path, '/');
+    if (!basename)
+      basename= path;
+    else
+      basename++;
+    context &ctx{*static_cast<context*>(sink.ha_data)};
+    const bool move{old && !ctx.archived};
+    uint64_t cp_buf[8]{};
+#ifdef _WIN32
+    ut_ad(!target.path == (sink.stream != sink.NO_STREAM));
+    std::string b;
+    const char *destname= nullptr;
+    if (!target.path)
+      goto send_file;
+    b= target.path;
+    b.push_back('/');
+    b.append(basename);
+    destname= b.c_str();
+    unsigned long err;
+    if (move)
+    {
+      if (!MoveFileEx(path, destname, MOVEFILE_COPY_ALLOWED))
+      {
+      fail:
+        err= GetLastError();
+      got_err:
+        my_osmaperr(err);
+        if (target.path)
+          my_error(ER_ERROR_ON_RENAME, MYF(ME_ERROR_LOG), path, basename,
+                   errno);
+        else
+          my_error(ER_IO_WRITE_ERROR, MYF(ME_ERROR_LOG),
+                   errno, strerror(errno), "BACKUP SERVER");
+        return -1;
+      }
+
+      if (lsn < ctx.checkpoint)
+      {
+        if (!SetFileAttributes(destname, FILE_ATTRIBUTE_NORMAL))
+          goto fail;
+        HANDLE dh= CreateFile(destname, GENERIC_WRITE,
+                              FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr,
+                              OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
+        if (dh == INVALID_HANDLE_VALUE)
+          goto fail;
+        if (os_file_set_sparse_win32(dh))
+          std::ignore=
+            os_file_punch_hole(dh, 0, log_sys.START_OFFSET +
+                               ((ctx.checkpoint - lsn) & ~4095ULL));
+        write_checkpoint_buf(cp_buf, ctx.checkpoint_end_lsn - lsn +
+                             log_sys.START_OFFSET);
+        int fail= write_checkpoint(dh, cp_buf);
+        std::ignore= CloseHandle(dh);
+        if (fail)
+          goto fail;
+      }
+      return 0;
+    }
+    else if (CreateHardLink(destname, path, nullptr))
+    {
+      ctx.note_hardlink(lsn);
+      return 0;
+    }
+
+    if ((err= GetLastError()) != ERROR_NOT_SAME_DEVICE)
+      goto got_err;
+    /* Hard-linking failed. Try copying with the final name. */
+    if (target.path)
+    {
+      b= target.path;
+      b.push_back('/');
+      b.append(basename);
+      destname= b.c_str();
+
+      if (lsn >= ctx.checkpoint && lsn < ctx.max_first_lsn)
+      {
+        /* Copy a middle log file entirely. */
+        if (CopyFileEx(path, basename, nullptr, nullptr, nullptr,
+                       COPY_FILE_NO_BUFFERING))
+          return 0;
+        goto fail;
+      }
+    }
+
+  send_file:
+    HANDLE src;
+    for (;;)
+    {
+      src= CreateFile(path, GENERIC_READ,
+                      FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                      my_win_file_secattr(), OPEN_EXISTING,
+                      FILE_ATTRIBUTE_NORMAL, nullptr);
+      if (src != INVALID_HANDLE_VALUE)
+        break;
+      switch (GetLastError()) {
+      case ERROR_SHARING_VIOLATION:
+      case ERROR_LOCK_VIOLATION:
+        std::this_thread::sleep_for(std::chrono::seconds(1));
+        continue;
+      }
+      goto fail;
+    }
+    HANDLE dst{sink.stream};
+    if (dst == INVALID_HANDLE_VALUE)
+    {
+      dst= CreateFile(destname, GENERIC_WRITE, 0, my_win_file_secattr(),
+                      CREATE_NEW, FILE_ATTRIBUTE_NORMAL, nullptr);
+      if (dst == INVALID_HANDLE_VALUE)
+      {
+        std::ignore= CloseHandle(src);
+        goto fail;
+      }
+    }
+#else
+    if (sink.stream != sink.NO_STREAM);
+    else if (move
+             ? !renameat(AT_FDCWD, path, target.fd, basename)
+             : !linkat(AT_FDCWD, path, target.fd, basename, AT_SYMLINK_FOLLOW))
+    {
+      if (!move)
+        ctx.note_hardlink(lsn);
+# ifdef __linux__
+      else if (lsn != ctx.first_lsn);
+      else if (off_t garbage= (ctx.checkpoint - lsn) & ~4095ULL)
+        /* Best effort to punch a hole to free up some garbage in
+        the first file. We do not care about failures. */
+        if (!fchmodat(target.fd, basename, 0644, 0))
+        {
+          int dst= openat(target.fd, basename, O_RDWR);
+          if (dst >= 0)
+            fallocate(dst, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
+                      log_sys.START_OFFSET, garbage);
+          close(dst);
+          std::ignore= fchmodat(target.fd, basename, 0444, 0);
+        }
+# endif
+      return 0;
+    }
+    else if (errno != EXDEV)
+    {
+    fail:
+      if (sink.stream == sink.NO_STREAM)
+        my_error(ER_ERROR_ON_RENAME, MYF(ME_ERROR_LOG), path, basename, errno);
+      else
+        my_error(ER_IO_WRITE_ERROR, MYF(ME_ERROR_LOG), errno, strerror(errno),
+                 "BACKUP SERVER");
+      return -1;
+    }
+
+    const int src{open(path, O_RDONLY)};
+    if (src < 0)
+      goto fail;
+    if (move && unlink(path))
+    {
+    close_and_fail:
+      std::ignore= close(src);
+      goto fail;
+    }
+    int dst{sink.stream};
+    if (dst < 0)
+    {
+      dst= openat(target.fd, basename,
+                  O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0666);
+      if (dst < 0)
+        goto close_and_fail;
+    }
+    int err;
+#endif
+    backup_chunk chunks[3], *chunk{chunks};
+    *chunk++= {log_sys.START_OFFSET, ctx.last_lsn - lsn};
+    if (lsn < ctx.checkpoint)
+    {
+      /* Copy the necessary part of the first log file. */
+      ut_ad(lsn == ctx.first_lsn);
+      write_checkpoint_buf(cp_buf, ctx.checkpoint_end_lsn - lsn +
+                           log_sys.START_OFFSET);
+      chunk[-1]= {0, 512};
+      const lsn_t end=
+        std::min(ctx.last_lsn, lsn + ctx.first_size - log_sys.START_OFFSET);
+      *chunk++=
+        {log_sys.START_OFFSET + ctx.checkpoint - lsn, end - ctx.checkpoint};
+      chunk->offset= end - lsn;
+      goto pad_size;
+    }
+    else if (lsn < ctx.max_first_lsn)
+    {
+      /* Copy a middle log file entirely. */
+#ifdef _WIN32
+      ut_ad(dst == sink.stream);
+      chunk->offset= os_file_get_size(src);
+#else
+      if (dst != sink.stream)
+      {
+        err= copy_entire_file(src, dst);
+        goto close_dst;
+      }
+      chunk->offset= uint64_t(lseek(src, 0, SEEK_END));
+#endif
+      /* Omit the checkpoint header from the stream. */
+      chunk[-1].length= chunk->offset - log_sys.START_OFFSET;
+      goto stream_file;
+    }
+    else
+    {
+      ut_ad(ctx.max_first_lsn == lsn);
+      ut_ad(ctx.last_lsn > lsn);
+      ut_ad(ctx.last_lsn != LSN_MAX);
+      ut_ad(chunk[-1].length == ctx.last_lsn - lsn);
+      chunk->offset= chunk[-1].length;
+    pad_size:
+      /* Set the logical size of the file. */
+      chunk->offset=
+        std::max<uint64_t>(log_sys.FILE_SIZE_MIN,
+                           (chunk->offset + (log_sys.START_OFFSET + 4095)) &
+                           ~4095ULL);
+    }
+
+    if (dst == sink.stream)
+    {
+    stream_file:
+      chunk++->length= 0;
+      const backup_chunk &end{chunk[-2]};
+      ut_ad(chunk - chunks == 2 || chunk - chunks == 3);
+      const size_t cp_size{(size_t(chunk - chunks) & 1) << 9};
+      err= backup_stream_start(dst, basename,
+                               0444 | int{lsn == ctx.max_first_lsn} << 7,
+                               end.length + cp_size, chunks, chunk - chunks);
+      if (!err && cp_size)
+        err= backup_stream_write(dst, cp_buf, sizeof cp_buf) ||
+          backup_stream_write(dst, field_ref_zero, cp_size - sizeof cp_buf);
+      if (!err)
+      {
+        err= backup_stream_append_async(src, dst, end.offset,
+                                        end.offset + end.length);
+        if (err);
+        else if (size_t pad= size_t(end.length) & 511)
+          err= backup_stream_write(dst, field_ref_zero, 512 - pad);
+      }
+    }
+    else
+    {
+      /* First, extend the file to a valid size. */
+#ifdef _WIN32
+      LARGE_INTEGER li;
+      li.QuadPart= chunk->offset;
+      err= !SetFilePointerEx(dst, li, nullptr, FILE_BEGIN) ||
+        !SetEndOfFile(dst) ||
+#else
+      err= ftruncate(dst, chunk->offset) ||
+#endif
+        copy_file(src, dst, chunk[-1].offset, chunk[-1].offset +
+                  chunk[-1].length) ||
+        (lsn < ctx.checkpoint && write_checkpoint(dst, cp_buf));
+#ifdef _WIN32
+      err|= !CloseHandle(dst);
+#else
+    close_dst:
+      err|= close(dst);
+#endif
+    }
+
+    if (err | IF_WIN(!CloseHandle(src), close(src)))
+      goto fail;
+
+    return 0;
+  }
+};
+
+/** The backup context; protected by log_sys.latch */
+static InnoDB_backup innodb_backup;
+}
+
+bool log_t::backup_start(uint64_t *old_size, THD *thd) noexcept
+{
+  ut_ad(latch_have_wr());
+  ut_ad(!backup);
+  backup= true;
+  *old_size= 0;
+  if (archive)
+    return false;
+  const uint64_t old_file_size{file_size};
+  latch.wr_unlock();
+  const bool fail{set_archive(true, thd, true)};
+  latch.wr_lock();
+  if (!fail)
+  {
+    *old_size= old_file_size;
+    return false;
+  }
+  ut_ad(backup);
+  backup= false;
+  const uint64_t new_file_size{file_size};
+  latch.wr_unlock();
+  if (old_file_size != new_file_size && old_file_size &&
+      resize_start(old_file_size, thd) == RESIZE_STARTED)
+    resize_finish(thd);
+  latch.wr_lock();
+  return true;
+}
+
+void log_t::backup_stop(uint64_t old_size, THD *thd) noexcept
+{
+  ut_ad(latch_have_wr());
+  /* We will be invoked with old_size=0 after a failed backup_start(),
+  or if innodb_log_archive=ON held during a successful backup_start(). */
+  ut_ad(!old_size || !resize_in_progress());
+  ut_ad(!old_size || backup);
+  backup= false;
+  const uint64_t new_size{file_size};
+  latch.wr_unlock();
+  if (old_size && old_size != new_size &&
+      resize_start(old_size, thd) == RESIZE_STARTED)
+    resize_finish(thd);
+}
+
+void *innodb_backup_start(THD *thd, const backup_target *,
+                          backup_phase phase, const backup_sink *sink) noexcept
+{
+  switch (phase) {
+  case BACKUP_PHASE_PREPARE_START:
+    if (!fil_system.have_all_spaces)
+    {
+      /* To speed up startup, InnoDB does not normally open all
+      tablespace files that are pointed to by SYS_TABLES.
+      InnoDB_backup::init() assumes that the information of all
+      tablespaces is available, including files that had been created
+      before the server was started, and never opened in the course of
+      the current server execution. */
+      dict_load_tablespaces(nullptr, true);
+      ut_ad(fil_system.have_all_spaces);
+    }
+    return 0;
+  case BACKUP_PHASE_START:
+    return innodb_backup.init(thd);
+  case BACKUP_PHASE_NO_COMMIT:
+    innodb_backup.commit();
+    /* fall through */
+  default:
+    return sink->ha_data;
+  }
+}
+
+int innodb_backup_step(THD *, const backup_target *target,
+                       backup_phase phase, const backup_sink *sink) noexcept
+{
+  switch (phase) {
+  case BACKUP_PHASE_START:
+  case BACKUP_PHASE_NO_COMMIT:
+  case BACKUP_PHASE_FINISH:
+    return innodb_backup.step(*target, phase, *sink);
+  default:
+    return 0;
+  }
+}
+
+int innodb_backup_end(THD *thd, const backup_target *target,
+                      backup_phase phase, const backup_sink *sink) noexcept
+{
+  switch (phase) {
+  default:
+    return 0;
+  case BACKUP_PHASE_FINISH:
+    return innodb_backup.fini(*target, *sink);
+  case BACKUP_PHASE_NO_COMMIT:
+  case BACKUP_PHASE_ABORT:
+    return innodb_backup.end(thd, phase, *sink);
+  }
+}
+
+void innodb_backup_checkpoint() noexcept
+{
+  innodb_backup.checkpoint_complete();
+}
diff --git a/storage/innobase/handler/backup_innodb.h b/storage/innobase/handler/backup_innodb.h
new file mode 100644
index 0000000000000..e9393038e5a21
--- /dev/null
+++ b/storage/innobase/handler/backup_innodb.h
@@ -0,0 +1,58 @@
+/* Copyright (c) 2026, MariaDB plc
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+/**
+   Start of a BACKUP SERVER phase,
+   when no innodb_backup_step() or innodb_backup_end() is pending.
+   @param thd     current session
+   @param target  backup target
+   @param phase   BACKUP_PHASE_START, ... (not BACKUP_PHASE_ABORT)
+   @param sink    worker context
+   @return backup context object to be attached to sink, or nullptr
+   @retval -1     on failure
+*/
+void *innodb_backup_start(THD *thd, const backup_target *target,
+                          backup_phase phase, const backup_sink *sink)
+  noexcept;
+
+/**
+   Process a file that was collected in innodb_backup_start().
+   @param thd     current session
+   @param target  backup target
+   @param phase   last phase on which backup_start() was successfully invoked
+   @param sink    worker context
+   @return number of files remaining, or negative on error
+   @retval 0 on completion
+*/
+int innodb_backup_step(THD *thd, const backup_target *target,
+                       backup_phase phase, const backup_sink *sink) noexcept;
+
+/**
+   Finish a phase, once all calls for the current phase are completed.
+   @param thd     current sesssion
+   @param target  backup target
+   @param phase   last phase on which backup_start() was successfully invoked,
+   or BACKUP_PHASE_ABORT or BACKUP_PHASE_FINISH
+   @param sink    worker context
+   @return error code
+   @retval 0 on success
+*/
+int innodb_backup_end(THD *thd, const backup_target *target,
+                      backup_phase phase, const backup_sink *sink) noexcept;
+
+/**
+   Complete the first checkpoint in a new archive log file.
+*/
+void innodb_backup_checkpoint() noexcept;
diff --git a/storage/innobase/handler/ha_innodb.cc b/storage/innobase/handler/ha_innodb.cc
index fdf9a90f4adde..74f8f5e8e1175 100644
--- a/storage/innobase/handler/ha_innodb.cc
+++ b/storage/innobase/handler/ha_innodb.cc
@@ -152,6 +152,7 @@ MDL_ticket *get_mdl_ticket(TABLE *table) noexcept;
 
 #include "ha_innodb.h"
 #include "i_s.h"
+#include "backup_innodb.h"
 
 #include <string>
 #include <sstream>
@@ -4195,6 +4196,9 @@ static int innodb_init(void* p)
 		= innodb_prepare_commit_versioned;
 
         innobase_hton->update_optimizer_costs= innobase_update_optimizer_costs;
+	innobase_hton->backup_start = innodb_backup_start;
+	innobase_hton->backup_step = innodb_backup_step;
+	innobase_hton->backup_end = innodb_backup_end;
         innobase_hton->binlog_init= innodb_binlog_init;
         innobase_hton->set_binlog_max_size= ibb_set_max_size;
         innobase_hton->binlog_write_direct_ordered=
@@ -18871,39 +18875,7 @@ static void innodb_log_file_size_update(THD *thd, st_mysql_sys_var*,
       ib_senderrf(thd, IB_LOG_LEVEL_ERROR, ER_CANT_CREATE_HANDLER_FILE);
       break;
     case log_t::RESIZE_STARTED:
-      for (timespec abstime;;)
-      {
-        if (thd_kill_level(thd))
-        {
-          log_sys.resize_abort(thd);
-          break;
-        }
-
-        set_timespec(abstime, 5);
-        mysql_mutex_lock(&buf_pool.flush_list_mutex);
-        lsn_t resizing= log_sys.resize_in_progress();
-        if (resizing > buf_pool.get_oldest_modification(0))
-        {
-          buf_pool.page_cleaner_wakeup(true);
-          my_cond_timedwait(&buf_pool.done_flush_list,
-                            &buf_pool.flush_list_mutex.m_mutex, &abstime);
-          resizing= log_sys.resize_in_progress();
-        }
-        mysql_mutex_unlock(&buf_pool.flush_list_mutex);
-        if (!resizing || !log_sys.resize_running(thd))
-          break;
-        log_sys.latch.wr_lock();
-        while (resizing > log_sys.get_lsn())
-        {
-          ut_ad(!log_sys.is_mmap());
-          /* The server is almost idle. Write dummy FILE_CHECKPOINT records
-          to ensure that the log resizing will complete. */
-          mtr_t mtr{nullptr};
-          mtr.start();
-          mtr.commit_files(log_sys.last_checkpoint_lsn);
-        }
-        log_sys.latch.wr_unlock();
-      }
+      log_sys.resize_finish(thd);
     }
   }
   mysql_mutex_lock(&LOCK_global_system_variables);
@@ -19760,7 +19732,9 @@ static void innodb_log_archive_update(THD *thd, st_mysql_sys_var*,
 {
   /* MDEV-36828 TODO: On failure, report which other setting
   conflicted with the request */
+  mysql_mutex_unlock(&LOCK_global_system_variables);
   log_sys.set_archive(*static_cast<const my_bool*>(save), thd);
+  mysql_mutex_lock(&LOCK_global_system_variables);
 }
 
 static MYSQL_SYSVAR_BOOL(log_archive, log_sys.archive,
@@ -19773,10 +19747,20 @@ static MYSQL_SYSVAR_UINT64_T(log_archive_start, innodb_log_archive_start,
   "initial value of innodb_lsn_archived; 0=auto-detect",
   nullptr, nullptr, 0, 0, std::numeric_limits<uint64_t>::max(), 0);
 
+static void innodb_log_recovery_start_update(THD *, st_mysql_sys_var*,
+                                             void *, const void *save) noexcept
+{
+  const lsn_t lsn{*static_cast<const uint64_t*>(save)};
+  recv_sys.recovery_start= lsn;
+  if (lsn && log_sys.archive)
+    log_sys.archived_checkpoint= lsn;
+}
+
 static MYSQL_SYSVAR_UINT64_T(log_recovery_start, recv_sys.recovery_start,
-  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
+  PLUGIN_VAR_RQCMDARG,
   "LSN to start recovery from (0=automatic)",
-  nullptr, nullptr, 0, 0, std::numeric_limits<uint64_t>::max(), 0);
+  nullptr, innodb_log_recovery_start_update,
+  0, 0, std::numeric_limits<uint64_t>::max(), 0);
 
 static MYSQL_SYSVAR_UINT64_T(log_recovery_target, recv_sys.rpo,
   PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
diff --git a/storage/innobase/include/fil0fil.h b/storage/innobase/include/fil0fil.h
index 67fa1bfd026f0..4111d4d399d8d 100644
--- a/storage/innobase/include/fil0fil.h
+++ b/storage/innobase/include/fil0fil.h
@@ -408,6 +408,13 @@ struct fil_space_t final
   /** Whether any corruption of this tablespace has been reported */
   mutable std::atomic_flag is_corrupted= ATOMIC_FLAG_INIT;
 
+  /** BACKUP SERVER flag in write_or_backup */
+  static constexpr uint8_t BACKUP{128};
+  /** whether there is a pending write or backup */
+  std::atomic<uint8_t> write_or_backup{0};
+  /** first page number that is not being backed up */
+  std::atomic<uint32_t> backup_end{0};
+
 public:
   /** mutex to protect freed_ranges and last_freed_lsn */
   std::mutex freed_range_mutex;
@@ -1058,6 +1065,46 @@ struct fil_space_t final
     VALIDATE_IMPORT
   };
 
+  /** Note that writes are being submitted to the tablespace.
+  @return whether a backup is pending */
+  bool writing_start() noexcept
+  {
+    uint8_t wb{write_or_backup.fetch_add(1, std::memory_order_acq_rel)};
+    ut_ad(~wb & (BACKUP - 1));
+    return wb & BACKUP;
+  }
+
+  /** Note that we there are no more pending writes to the tablespace. */
+  void writing_stop() noexcept
+  {
+    ut_d(uint8_t wb=) write_or_backup.fetch_sub(1, std::memory_order_release);
+    ut_ad(wb & ~BACKUP);
+  }
+
+  /** Note that we backing up some pages of the underlying files.
+  @param last_page   the last page that is being backed up */
+  bool backup_start(uint32_t last_page) noexcept
+  {
+    backup_end.store(last_page, std::memory_order_relaxed);
+    uint8_t wb{write_or_backup.fetch_add(BACKUP, std::memory_order_acq_rel)};
+    ut_ad(!(wb & BACKUP));
+    return wb & ~BACKUP;
+  }
+  /** Note that we are not currently backing up the underlying files. */
+  void backup_stop() noexcept
+  {
+    backup_end.store(0, std::memory_order_relaxed);
+    ut_d(uint8_t wb=)
+      write_or_backup.fetch_sub(BACKUP, std::memory_order_release);
+    ut_ad(wb & BACKUP);
+  }
+  /** @return the first page number that is not being backed up */
+  uint32_t backup_page_end() const noexcept
+  { return backup_end.load(std::memory_order_relaxed); }
+
+  /** The size of a backup copy_file() batch in pages */
+  static constexpr uint32_t BACKUP_BATCH_SIZE{64};
+
   /** Update the data structures on write completion */
   void complete_write() noexcept;
 
@@ -1463,6 +1510,8 @@ struct fil_system_t
   my_bool buffered;
   /** whether fdatasync() is needed on data files */
   Atomic_relaxed<bool> need_unflushed_spaces;
+  /** whether dict_load_tablespaces(nullptr, true) is unnecessary */
+  Atomic_relaxed<bool> have_all_spaces;
 
   /** Try to enable or disable write-through of data files */
   void set_write_through(bool write_through);
diff --git a/storage/innobase/include/log0log.h b/storage/innobase/include/log0log.h
index 44a827dbf636d..6d07fa25e013d 100644
--- a/storage/innobase/include/log0log.h
+++ b/storage/innobase/include/log0log.h
@@ -221,6 +221,8 @@ struct log_t
   /** whether !archive log records may have been written with
   get_sequence_bit()==0 */
   bool circular_recovery_from_sequence_bit_0:1;
+  /** whether we are between backup_start() and backup_stop() */
+  bool backup:1;
 public:
   /** the default value of log_mmap */
   static constexpr bool log_mmap_default=
@@ -288,6 +290,8 @@ struct log_t
   Atomic_relaxed<lsn_t> last_checkpoint_lsn;
   /** The log writer (protected by latch.wr_lock()) */
   lsn_t (*writer)() noexcept;
+  /** the earliest available checkpoint; protected by latch.wr_lock() */
+  lsn_t archived_checkpoint;
   /** end_lsn of the first available checkpoint, or 0;
   protected by latch.wr_lock() */
   lsn_t archived_lsn;
@@ -369,11 +373,24 @@ struct log_t
     RESIZE_NO_CHANGE, RESIZE_IN_PROGRESS, RESIZE_STARTED, RESIZE_FAILED
   };
 
+private:
   /** Start resizing the log and release the exclusive latch.
+  @param size   requested new file_size
+  @param thd    the current thread identifier
+  @param backup whether the caller is backup_start() or backup_stop()
+  @return whether the resizing was started successfully */
+  resize_start_status resize_start(uint64_t size, void *thd, bool backup)
+    noexcept;
+public:
+  /** Start resizing the log.
   @param size  requested new file_size
   @param thd   the current thread identifier
   @return whether the resizing was started successfully */
-  resize_start_status resize_start(os_offset_t size, void *thd) noexcept;
+  resize_start_status resize_start(uint64_t size, void *thd) noexcept
+  { return resize_start(size, thd, false); }
+
+  /** Wait for the completion of resize_start() == RESIZE_STARTED */
+  void resize_finish(THD *thd) noexcept;
 
   /** Abort a resize_start() that we started.
   @param thd  thread identifier that had been passed to resize_start() */
@@ -397,10 +414,37 @@ struct log_t
       resize_write_low<mmap>(lsn, end, len, seq);
   }
 
+private:
+  /** SET GLOBAL innodb_log_archive, or start/stop BACKUP SERVER
+  @param archive  the new value of innodb_log_archive
+  @param thd      SQL connection
+  @param backup   whether the caller is backup_start() or backup_stop()
+  @return whether the operation failed */
+  bool set_archive(my_bool archive, THD *thd, bool backup) noexcept;
+public:
   /** SET GLOBAL innodb_log_archive
   @param archive  the new value of innodb_log_archive
-  @param thd      SQL connection */
-  void set_archive(my_bool archive, THD *thd) noexcept;
+  @param thd      SQL connection
+  @return whether the operation failed */
+  bool set_archive(my_bool archive, THD *thd) noexcept
+  { return set_archive(archive, thd, false); }
+
+  /** Start BACKUP SERVER.
+  @param old_size  the old file_size, or 0 on failure or when
+                   already running innodb_log_archive=ON
+  @param thd       SQL connection
+  @return whether the operation failed */
+  bool backup_start(uint64_t *old_size, THD *thd) noexcept;
+  /** Stop log archiving in BACKUP SERVER clean-up
+  @param thd       SQL connection
+  @return whether the operation failed */
+  bool backup_stop_archiving(THD *thd) noexcept
+  { return set_archive(false, thd, true); }
+
+  /** Stop BACKUP SERVER.
+  @param old_size  the value returned by backup_start()
+  @param thd       SQL connection */
+  void backup_stop(uint64_t old_size, THD *thd) noexcept;
 
 private:
   /** Replicate a write to the log.
@@ -695,6 +739,18 @@ struct log_t
   /** @return the first LSN of the log file */
   lsn_t get_first_lsn() const noexcept { return first_lsn; }
 
+  /**
+     Determine the latest checkpoint.
+     @param end   LSN leading to the FILE_CHECKPOINT record
+     @return the latest checkpoint LSN
+  */
+  lsn_t get_latest_checkpoint(lsn_t &end) const noexcept
+  {
+    ut_ad(latch_have_any());
+    end= end_lsn;
+    return last_checkpoint_lsn;
+  }
+
   /** Set the recovered checkpoint.
   @param lsn      log sequence number of the checkpoint
   @param end_lsn  LSN passed to write_checkpoint()
diff --git a/storage/innobase/log/log0log.cc b/storage/innobase/log/log0log.cc
index ee8d43a68e500..c313b3d9b5156 100644
--- a/storage/innobase/log/log0log.cc
+++ b/storage/innobase/log/log0log.cc
@@ -635,7 +635,7 @@ void log_t::set_buffered(bool buffered) noexcept
 }
 #endif
 
-  /** Try to enable or disable durable writes (update log_write_through) */
+/** Try to enable or disable durable writes (update log_write_through) */
 void log_t::set_write_through(bool write_through)
 {
   if (is_mmap() || high_level_read_only || recv_sys.rpo)
@@ -764,9 +764,12 @@ void log_t::header_rewrite(my_bool archive) noexcept
 
 /** SET GLOBAL innodb_log_archive
 @param archive  the new value of innodb_log_archive
-@param thd      SQL connection */
-void log_t::set_archive(my_bool archive, THD *thd) noexcept
+@param thd      SQL connection
+@param backup   whether the caller is backup_start() or backup_stop()
+@return whether the operation failed */
+bool log_t::set_archive(my_bool archive, THD *thd, bool backup) noexcept
 {
+  bool fail= false;
   thd_wait_begin(thd, THD_WAIT_DISKIO);
   tpool::tpool_wait_begin();
   lsn_t wait_lsn;
@@ -780,12 +783,20 @@ void log_t::set_archive(my_bool archive, THD *thd) noexcept
       my_printf_error(ER_WRONG_USAGE,
                       "SET GLOBAL innodb_log_file_size is in progress",
                       MYF(0));
+    fail:
+      fail= true;
+      wait_lsn= 0;
       break;
     }
     if (archive == this->archive)
       break;
-    if (thd_kill_level(thd))
-      break;
+    if ((!backup || archive) && thd_kill_level(thd))
+      goto fail;
+    if (!backup && this->backup)
+    {
+      my_printf_error(ER_WRONG_USAGE, "BACKUP SERVER is in progress", MYF(0));
+      goto fail;
+    }
 
     if (resize_log.is_opened())
     {
@@ -799,7 +810,7 @@ void log_t::set_archive(my_bool archive, THD *thd) noexcept
       if (wait_lsn)
       {
         mysql_mutex_lock(&buf_pool.flush_list_mutex);
-        buf_flush_wait(wait_lsn, false);
+        buf_flush_wait(wait_lsn, !UT_LIST_GET_LEN(buf_pool.flush_list));
         mysql_mutex_unlock(&buf_pool.flush_list_mutex);
       }
       latch.wr_unlock();
@@ -894,7 +905,7 @@ void log_t::set_archive(my_bool archive, THD *thd) noexcept
       if (!log.is_opened())
       {
         my_error(ER_ERROR_ON_READ, MYF(0), old_name, errno);
-        break;
+        goto fail;
       }
     }
 #endif
@@ -919,7 +930,7 @@ void log_t::set_archive(my_bool archive, THD *thd) noexcept
     {
       my_error(ER_ERROR_ON_RENAME, MYF(0), old_name, new_name, my_errno);
       first_lsn= old_first_lsn;
-      break;
+      goto fail;
     }
 
     if (archive)
@@ -951,14 +962,16 @@ void log_t::set_archive(my_bool archive, THD *thd) noexcept
   thd_wait_end(thd);
   if (wait_lsn)
     mtr_flush_ahead(wait_lsn);
+  return fail;
 }
 
-/** Start resizing the log and release the exclusive latch.
-@param size  requested new file_size
-@param thd   the current thread identifier
+/** Start resizing the log.
+@param size   requested new file_size
+@param thd    the current thread identifier
+@param backup whether the caller is backup_start() or backup_stop()
 @return whether the resizing was started successfully */
-log_t::resize_start_status log_t::resize_start(os_offset_t size, void *thd)
-  noexcept
+log_t::resize_start_status log_t::resize_start(uint64_t size, void *thd,
+                                               bool backup) noexcept
 {
   ut_ad(size >= 4U << 20);
   ut_ad(!(size & 4095));
@@ -989,6 +1002,9 @@ log_t::resize_start_status log_t::resize_start(os_offset_t size, void *thd)
       resize_target= size;
     }
   }
+  else if (!backup && this->backup)
+    /* backup_start() or backup_stop() is running */
+    status= RESIZE_FAILED;
   else
   {
     lsn_t start_lsn;
@@ -1090,6 +1106,44 @@ log_t::resize_start_status log_t::resize_start(os_offset_t size, void *thd)
   return status;
 }
 
+/** Wait for the completion of resize_start() == RESIZE_STARTED */
+void log_t::resize_finish(THD *thd) noexcept
+{
+  for (timespec abstime;;)
+  {
+    if (thd_kill_level(thd))
+    {
+      resize_abort(thd);
+      break;
+    }
+
+    set_timespec(abstime, 5);
+    mysql_mutex_lock(&buf_pool.flush_list_mutex);
+    lsn_t resizing= resize_in_progress();
+    if (resizing > buf_pool.get_oldest_modification(0))
+    {
+      buf_pool.page_cleaner_wakeup(true);
+      my_cond_timedwait(&buf_pool.done_flush_list,
+                        &buf_pool.flush_list_mutex.m_mutex, &abstime);
+      resizing= resize_in_progress();
+    }
+    mysql_mutex_unlock(&buf_pool.flush_list_mutex);
+    if (!resizing || !resize_running(thd))
+      break;
+    latch.wr_lock();
+    while (resizing > get_lsn())
+    {
+      ut_ad(!is_mmap());
+      /* The server is almost idle. Write dummy FILE_CHECKPOINT records
+      to ensure that the log resizing will complete. */
+      mtr_t mtr{nullptr};
+      mtr.start();
+      mtr.commit_files(last_checkpoint_lsn);
+    }
+    latch.wr_unlock();
+  }
+}
+
 /** Abort a resize_start() that we started. */
 void log_t::resize_abort(void *thd) noexcept
 {
diff --git a/storage/innobase/log/log0recv.cc b/storage/innobase/log/log0recv.cc
index 39b17bb30c649..f126fc613c8ec 100644
--- a/storage/innobase/log/log0recv.cc
+++ b/storage/innobase/log/log0recv.cc
@@ -2099,6 +2099,7 @@ dberr_t recv_sys_t::find_checkpoint()
     memset_aligned<4096>(const_cast<byte*>(field_ref_zero), 0, 4096);
     /* Mark the redo log for upgrading. */
     lsn= file_checkpoint= log_sys.last_checkpoint_lsn;
+    log_sys.archived_checkpoint= lsn;
     log_sys.set_recovered_lsn(lsn);
     if (rpo && rpo != lsn)
     {
@@ -2177,7 +2178,8 @@ dberr_t recv_sys_t::find_checkpoint()
         log_sys.set_recovered_checkpoint(checkpoint_lsn, lsn= end_lsn,
                                          field == log_t::CHECKPOINT_1);
     }
-    if (!log_sys.last_checkpoint_lsn)
+    log_sys.archived_checkpoint= log_sys.last_checkpoint_lsn;
+    if (!log_sys.archived_checkpoint)
       goto got_no_checkpoint;
     else if (!log_sys.archived_lsn)
       log_sys.archived_lsn= lsn;
diff --git a/storage/innobase/os/os0file.cc b/storage/innobase/os/os0file.cc
index 6494c5e21b96e..4ef86095f78a3 100644
--- a/storage/innobase/os/os0file.cc
+++ b/storage/innobase/os/os0file.cc
@@ -2017,7 +2017,15 @@ os_file_create_func(
 	);
 
 	DWORD		create_flag = OPEN_EXISTING;
-	DWORD		share_mode = read_only
+	/* BACKUP SERVER may invoke CreateHardLink() on a log file that
+	may concurrently be written to. This is why we must allow
+	FILE_SHARE_WRITE. This has the side effect that multiple InnoDB
+	instances may be concurrently started on the same log file.
+	However, InnoDB will not write any log before it has successfully
+	opened data files. As long as the multiple instances are also
+	opening the same InnoDB data files (such as the system tablespace),
+	they should fail to start up concurrently. */
+	DWORD		share_mode = read_only || type == OS_LOG_FILE
 		? FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE
 		: FILE_SHARE_READ | FILE_SHARE_DELETE;
 
diff --git a/storage/maria/CMakeLists.txt b/storage/maria/CMakeLists.txt
index 9d528f980dc5b..974145ce8ea6c 100644
--- a/storage/maria/CMakeLists.txt
+++ b/storage/maria/CMakeLists.txt
@@ -45,6 +45,7 @@ SET(ARIA_SOURCES ma_init.c ma_open.c ma_extra.c ma_info.c ma_rkey.c
             ha_maria.h maria_def.h ma_recovery_util.c ma_servicethread.c
             ma_norec.c
             ma_crypt.c ma_backup.c
+            ma_backup_server.cc ma_backup_server.h
 )
 
 IF(APPLE)
diff --git a/storage/maria/ha_maria.cc b/storage/maria/ha_maria.cc
index 8f5e47daea728..802ad0f9fcc19 100644
--- a/storage/maria/ha_maria.cc
+++ b/storage/maria/ha_maria.cc
@@ -23,6 +23,7 @@
 #include <myisampack.h>
 #include <my_bit.h>
 #include "ha_maria.h"
+#include "ma_backup_server.h"
 #include "trnman_public.h"
 #include "trnman.h"
 
@@ -3942,6 +3943,9 @@ static int ha_maria_init(void *p)
   maria_hton->prepare_for_backup= maria_prepare_for_backup;
   maria_hton->end_backup= maria_end_backup;
   maria_hton->update_optimizer_costs= aria_update_optimizer_costs;
+  maria_hton->backup_start= aria_backup_start;
+  //maria_hton->backup_step= aria_backup_step;
+  maria_hton->backup_end= aria_backup_end;
 
   /* TODO: decide if we support Maria being used for log tables */
   maria_hton->flags= (HTON_CAN_RECREATE | HTON_SUPPORT_LOG_TABLES |
diff --git a/storage/maria/ma_backup_server.cc b/storage/maria/ma_backup_server.cc
new file mode 100644
index 0000000000000..25777dff3c19a
--- /dev/null
+++ b/storage/maria/ma_backup_server.cc
@@ -0,0 +1,453 @@
+/* Copyright (c) 2026, MariaDB plc
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+#include "maria_def.h"
+#include "ma_backup_server.h"
+#include "mysqld_error.h"
+#if 1 // tc_purge(), tdc_purge()
+# include "sql_class.h"
+# include "table_cache.h"
+#endif
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+#include "span.h"
+
+/*
+  Implementation of functions declatred in ma_backup.h:
+  BACKUP SERVER support for Aria engine
+*/
+
+namespace
+{
+  /** Backup state; protected by log_sys.latch */
+  class Aria_backup
+  {
+  public:
+    Aria_backup()= default;
+    ~Aria_backup()
+    {
+#ifndef _WIN32
+      if (datadir_fd >= 0)
+        std::ignore= close(datadir_fd);
+      if (logdir_fd >= 0)
+        std::ignore= close(logdir_fd);
+#endif
+      if (translog_purge_disabled)
+        translog_enable_purge();
+    }
+
+    bool initialize() noexcept
+    {
+#ifndef _WIN32
+      /* Aria table files live under the server data directory
+      (mysql_real_data_home), while the transaction logs and control file
+      live under aria_log_dir_path (maria_data_root). These differ when
+      aria_log_dir_path is set, so open and scan them separately. */
+      datadir_fd= open(mysql_real_data_home, O_DIRECTORY);
+      if (datadir_fd < 0)
+      {
+        my_error(ER_CANT_READ_DIR, MYF(0), mysql_real_data_home, errno);
+        return true;
+      }
+      logdir_fd= open(maria_data_root, O_DIRECTORY);
+      if (logdir_fd < 0)
+      {
+        my_error(ER_CANT_READ_DIR, MYF(0), maria_data_root, errno);
+        return true;
+      }
+#endif // _WIN32
+      assert(!translog_purge_disabled);
+      translog_purge_disabled= true;
+      translog_disable_purge();
+      return false;
+    }
+
+    int end(const backup_target &target, const backup_sink &sink) noexcept
+    {
+      int ret_val= perform_backup(target, sink);
+      assert(translog_purge_disabled);
+      translog_purge_disabled= false;
+      translog_enable_purge();
+      return ret_val;
+    }
+  private:
+#ifndef _WIN32
+    /** The server data directory (Aria table files) */
+    int datadir_fd{-1};
+    /** The Aria log directory aria_log_dir_path (logs, control file) */
+    int logdir_fd{-1};
+#endif
+    /** whether the Aria translog_disable_purge() is in effect */
+    bool translog_purge_disabled{false};
+    static constexpr const char zerobuf[511]{};
+    using dir_contents = std::vector<std::string>;
+    using database_dir = std::pair<std::string, dir_contents>;
+    std::vector<database_dir> database_dirs;
+    std::vector<std::string> log_files;
+    bool have_control_file = false;
+
+    int perform_backup(const backup_target &target, const backup_sink &sink)
+      noexcept
+    {
+      return scan_datadir() || copy_databases(target, sink) ||
+        copy_control_file(target, sink) ||
+        translog_flush(translog_get_horizon()) ||
+        copy_logs(target, sink);
+    }
+
+    ATTRIBUTE_COLD ATTRIBUTE_NOINLINE
+      static int dir_error(const char *name) noexcept
+    {
+      my_error(ER_CANT_READ_DIR, MYF(0), name, my_errno);
+      return 1;
+    }
+
+    int scan_datadir() noexcept
+    {
+      /* Scan the server data directory for Aria table files. */
+      MY_DIR *data_dir= my_dir(mysql_real_data_home, MYF(MY_WANT_STAT));
+      if (!data_dir)
+        return dir_error(mysql_real_data_home);
+      int fail= 0;
+      for (const fileinfo &fi :
+             st_::span<const fileinfo>{data_dir->dir_entry,
+                                       data_dir->number_of_files})
+        if ((fi.mystat->st_mode & S_IFMT) == S_IFDIR)
+          if ((fail= scan_database_dir(fi.name)) != 0)
+            break;
+      my_dirend(data_dir);
+      if (fail)
+        return fail;
+
+      /* Scan aria_log_dir_path for the transaction logs and control file. */
+      MY_DIR *log_dir= my_dir(maria_data_root, MYF(MY_WANT_STAT));
+      if (!log_dir)
+        return dir_error(maria_data_root);
+      for (const fileinfo &fi :
+             st_::span<const fileinfo>{log_dir->dir_entry,
+                                       log_dir->number_of_files})
+      {
+        if (!strncmp(fi.name, C_STRING_WITH_LEN("aria_log.")))
+          log_files.emplace_back(fi.name);
+        else if (!strcmp(fi.name, "aria_log_control"))
+          have_control_file = true;
+      }
+      my_dirend(log_dir);
+      return 0;
+    }
+
+    int scan_database_dir(const char* dir_name) noexcept
+    {
+      const std::string dir_path{make_path(mysql_real_data_home, dir_name)};
+      MY_DIR *dir_info= my_dir(dir_path.c_str(), MYF(MY_WANT_STAT));
+      if (!dir_info)
+        return dir_error(dir_path.c_str());
+      std::vector<std::string> files_to_backup;
+      for (const fileinfo &fi :
+             st_::span<const fileinfo>{dir_info->dir_entry,
+                                       dir_info->number_of_files})
+        if (is_db_file(fi.name))
+          files_to_backup.emplace_back(fi.name);
+      if (!files_to_backup.empty())
+        database_dirs.emplace_back(dir_name, std::move(files_to_backup));
+      my_dirend(dir_info);
+      return 0;
+    }
+
+    int copy_databases(const backup_target &target, const backup_sink &sink)
+      noexcept
+    {
+      for (const database_dir &dir : database_dirs)
+      {
+        if (sink.stream != sink.NO_STREAM);
+        else if (int fail= ensure_target_subdir(target, dir.first.c_str()))
+          return fail;
+        if (int fail= copy_database(target, sink, dir))
+          return fail;
+      }
+      return 0;
+    }
+
+    /*
+       Create directory in the target directory if it does not exist.
+       Return 0 on success, non-0 on failure. Set errno in case of failure
+    */
+    int ensure_target_subdir(const backup_target &target, const char *name)
+      noexcept
+    {
+#ifdef _WIN32
+      if (CreateDirectory(make_path(target.path, name).c_str(), nullptr))
+        return 0;
+      DWORD err= GetLastError();
+      if (err == ERROR_ALREADY_EXISTS)
+        return 0;
+      my_osmaperr(err);
+#else
+      if (likely(!mkdirat(target.fd, name, 0777) || errno == EEXIST))
+        return 0;
+#endif
+      my_error(ER_CANT_CREATE_FILE, MYF(0), name, errno);
+      return 1;
+    }
+
+    int copy_database(const backup_target &target, const backup_sink &sink,
+                      const database_dir& dir) noexcept
+    {
+      std::string file_path;
+      for (const std::string &file : dir.second)
+      {
+        file_path= dir.first;
+        file_path.push_back('/');
+        file_path.append(file);
+        if (int fail= copy_file(target, sink, file_path.c_str(), false))
+          return fail;
+      }
+      return 0;
+    }
+
+    int copy_control_file(const backup_target &target, const backup_sink &sink)
+      noexcept
+    {
+      if (!have_control_file)
+        return 0;
+      return copy_file(target, sink, "aria_log_control", true);
+    }
+
+    int copy_logs(const backup_target &target, const backup_sink &sink)
+      noexcept
+    {
+      for (const std::string &file : log_files)
+        if (int fail= copy_file(target, sink, file.c_str(), true))
+          return fail;
+      return 0;
+    }
+
+    int copy_file(const backup_target &target, const backup_sink &sink,
+                  const char *path, bool is_log) const noexcept
+    {
+#ifndef _WIN32
+      int ret_val{0};
+      int src_fd{openat(is_log ? logdir_fd : datadir_fd, path, O_RDONLY)};
+      if (src_fd < 0)
+      {
+        my_error(ER_CANT_OPEN_FILE, MYF(0), path, errno);
+        return 1;
+      }
+      int tgt_fd{sink.stream};
+      if (tgt_fd == sink.NO_STREAM)
+      {
+        tgt_fd= openat(target.fd, path,
+                       O_CREAT | O_EXCL | O_WRONLY, 0666);
+        if (tgt_fd < 0)
+        {
+          my_error(ER_CANT_CREATE_FILE, MYF(0), path, errno);
+          ret_val= 1;
+        }
+        else
+        {
+          ret_val= copy_entire_file(src_fd, tgt_fd);
+          if (ret_val | close(tgt_fd))
+          {
+          write_error:
+            my_error(ER_ERROR_ON_WRITE, MYF(0), path, errno);
+            ret_val= 1;
+          }
+        }
+      }
+      else
+      {
+        uint64_t end= uint64_t(lseek(src_fd, 0, SEEK_END));
+        if (backup_stream_start(tgt_fd, path, 0644, end, nullptr, 0) ||
+            backup_stream_append(src_fd, tgt_fd, 0, end))
+          goto write_error;
+        if (size_t pad= size_t(end) & 511)
+          if (backup_stream_write(tgt_fd, zerobuf, 512 - pad))
+            goto write_error;
+      }
+
+      close(src_fd);
+      return ret_val;
+#else
+      const std::string src_path
+        {make_path(is_log ? maria_data_root : mysql_real_data_home, path)};
+
+      if (sink.stream == sink.NO_STREAM)
+      {
+        std::string dest_path{make_path(target.path, path)};
+        if (!CopyFileEx(src_path.c_str(), dest_path.c_str(),
+                        nullptr, nullptr, nullptr, COPY_FILE_NO_BUFFERING))
+        {
+          my_osmaperr(GetLastError());
+          my_error(ER_CANT_CREATE_FILE, MYF(0), dest_path.c_str(), errno);
+          return 1;
+        }
+      }
+      else
+      {
+        HANDLE src, dst{sink.stream};
+        for (;;)
+        {
+          src= CreateFile(src_path.c_str(), GENERIC_READ,
+                          FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,
+                          my_win_file_secattr(), OPEN_EXISTING,
+                          FILE_ATTRIBUTE_NORMAL, nullptr);
+          if (src != INVALID_HANDLE_VALUE)
+            break;
+          switch (GetLastError()) {
+          case ERROR_SHARING_VIOLATION:
+          case ERROR_LOCK_VIOLATION:
+            std::this_thread::sleep_for(std::chrono::seconds(1));
+            continue;
+          }
+
+          my_osmaperr(GetLastError());
+          my_error(ER_FILE_NOT_FOUND, MYF(ME_ERROR_LOG), src_path.c_str(),
+                   errno);
+          return -1;
+        }
+
+        LARGE_INTEGER li;
+        if (!GetFileSizeEx(src, &li))
+        {
+        write_error:
+          my_osmaperr(GetLastError());
+          my_error(ER_ERROR_ON_WRITE, MYF(0), path, errno);
+          if (src != INVALID_HANDLE_VALUE)
+            CloseHandle(src);
+          return -1;
+        }
+
+        if (backup_stream_start(dst, path, 0644, li.QuadPart, nullptr, 0) ||
+            backup_stream_append_plain(src, dst, 0, li.QuadPart))
+          goto write_error;
+
+        if (size_t pad= size_t(li.LowPart) & 511)
+          if (backup_stream_write(dst, zerobuf, 512 - pad))
+            goto write_error;
+        if (!CloseHandle(src))
+        {
+          src= INVALID_HANDLE_VALUE;
+          goto write_error;
+        }
+      }
+      return 0;
+#endif
+    }
+
+
+    static bool is_db_file(const char* file_name) noexcept
+    {
+      size_t len= strlen(file_name);
+      if (len < 4)
+        return false;
+      uint32_t suffix;
+      memcpy(&suffix, file_name + len - 4, 4);
+      switch (suffix) {
+      default:
+        return len == 6 && !memcmp(file_name, C_STRING_WITH_LEN("db.opt"));
+#ifdef WORDS_BIGENDIAN
+      case 0x2e41524d: /* .ARM ENGINE=ARCHIVE metadata */
+      case 0x2e41525a: /* .ARZ ENGINE=ARCHIVE compressed data */
+      case 0x2e43534d: /* .CSM ENGINE=CSV metadata */
+      case 0x2e435356: /* .CSV ENGINE=CSV data ("comma separated values") */
+      case 0x2e4d4144: /* .MAD ENGINE=Aria data heap */
+      case 0x2e4d4149: /* .MAI ENGINE=Aria indexes */
+      case 0x2e4d5247: /* .MRG ENGINE=MRG_MyISAM */
+      case 0x2e4d5944: /* .MYD ENGINE=MyISAM data heap */
+      case 0x2e4d5949: /* .MYI ENGINE=MyISAM indexes */
+      case 0x2e66726d: /* .frm form (SHOW CREATE TABLE) */
+      case 0x2e706172: /* .par PARTITION metadata */
+#else
+      case 0x4d52412e: /* .ARM ENGINE=ARCHIVE metadata */
+      case 0x5a52412e: /* .ARZ ENGINE=ARCHIVE compressed data */
+      case 0x4d53432e: /* .CSM ENGINE=CSV metadata */
+      case 0x5653432e: /* .CSV ENGINE=CSV data ("comma separated values") */
+      case 0x44414d2e: /* .MAD ENGINE=Aria data heap */
+      case 0x49414d2e: /* .MAI ENGINE=Aria indexes */
+      case 0x47524d2e: /* .MRG ENGINE=MRG_MyISAM */
+      case 0x44594d2e: /* .MYD ENGINE=MyISAM data heap */
+      case 0x49594d2e: /* .MYI ENGINE=MyISAM indexes */
+      case 0x6d72662e: /* .frm form (SHOW CREATE TABLE) */
+      case 0x7261702e: /* .par PARTITION metadata */
+#endif
+        return true;
+      }
+    }
+
+    /**
+       Construct a file path.
+       @param dir   directory name
+       @param name  file name
+       @return dir/name
+    */
+    static std::string make_path(const char *dir, const char *name)
+    {
+      std::string path{dir};
+      path.push_back('/');
+      path.append(name);
+      return path;
+    }
+  };
+}
+
+void *aria_backup_start(THD *thd, const backup_target *target,
+                        backup_phase phase, const backup_sink *sink) noexcept
+{
+  switch (phase) {
+  case BACKUP_PHASE_PREPARE_START:
+    return 0;
+  default:
+    return sink->ha_data;
+  case BACKUP_PHASE_NO_COMMIT:
+    assert(!sink->ha_data);
+    Aria_backup *aria_backup{new Aria_backup};
+    if (aria_backup->initialize())
+    {
+      delete aria_backup;
+      return reinterpret_cast<void*>(-1);
+    }
+    return aria_backup;
+  }
+}
+
+#if 0 // FIXME: implement the actual copying here
+int aria_backup_step(THD*, const backup_target*, backup_phase,
+                     const backup_sink*) noexcept
+{
+  return 0;
+}
+#endif
+
+int aria_backup_end(THD *thd, const backup_target *target, backup_phase phase,
+                    const backup_sink *sink) noexcept
+{
+  Aria_backup *aria_backup= static_cast<Aria_backup*>(sink->ha_data);
+  switch (phase) {
+  case BACKUP_PHASE_NO_COMMIT:
+    assert(aria_backup);
+#if 1 // FIXME: invoke these only for Aria, MyISAM, CSV but not others
+    tc_purge();
+    tdc_purge(true);
+#endif
+    return aria_backup->end(*target, *sink);
+  case BACKUP_PHASE_FINISH:
+    delete aria_backup;
+    /* fall through */
+  default:
+    return 0;
+  }
+}
diff --git a/storage/maria/ma_backup_server.h b/storage/maria/ma_backup_server.h
new file mode 100644
index 0000000000000..6c72bb46eb60f
--- /dev/null
+++ b/storage/maria/ma_backup_server.h
@@ -0,0 +1,58 @@
+/* Copyright (c) 2026, MariaDB plc
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+#pragma once
+
+/* BACKUP SERVER support for Aria engine. */
+
+#include <sql_backup_interface.h>
+#include <handler.h>
+
+/**
+   Start of a BACKUP SERVER phase,
+   when no aria_backup_step() or aria_backup_end() is pending.
+   @param thd     current session
+   @param target  backup target
+   @param phase   BACKUP_PHASE_START, ... (not BACKUP_PHASE_ABORT)
+   @param sink    worker context
+   @return backup context object to be attached to backup_target, or nullptr
+   @retval -1     on failure
+*/
+void *aria_backup_start(THD *thd, const backup_target *target,
+                        backup_phase phase, const backup_sink *sink) noexcept;
+
+/**
+   Process a file that was collected in aria_backup_start().
+   @param thd   current session
+   @param target  backup target
+   @param phase   last phase on which backup_start() was successfully invoked
+   @param sink    worker context
+   @retval 0 on completion
+*/
+int aria_backup_step(THD *thd, const backup_target *target, backup_phase phase,
+                     const backup_sink *sink) noexcept;
+
+/**
+   Finish a phase, once all calls for the current phase are completed.
+   @param thd   current session
+   @param target  backup target
+   @param phase   last phase on which backup_start() was successfully invoked,
+   or BACKUP_PHASE_ABORT or BACKUP_PHASE_FINISH
+   @param sink    worker context
+   @return error code
+   @retval 0 on success
+*/
+int aria_backup_end(THD *thd, const backup_target *target, backup_phase phase,
+                    const backup_sink *sink) noexcept;