Ubuntu Manpage: borg-recreate - Re-create archives

Provided by: borgbackup_1.1.15-1~ubuntu1.18.04.2_amd64

NAME

       borg-recreate - Re-create archives

SYNOPSIS

       borg [common options] recreate [options] [REPOSITORY_OR_ARCHIVE] [PATH...]

DESCRIPTION

Recreate the contents of existing archives.

recreate is a potentially dangerous function and might lead to data loss (if used
wrongly). BE VERY CAREFUL!

--exclude, --exclude-from, --exclude-if-present, --keep-exclude-tags and PATH have the
exact same semantics as in "borg create", but they only check for files in the archives
and not in the local file system. If PATHs are specified, the resulting archives will only
contain files from these PATHs.

Note that all paths in an archive are relative, therefore absolute patterns/paths will not
match (--exclude, --exclude-from, PATHs).

--recompress allows to change the compression of existing data in archives. Due to how
Borg stores compressed size information this might display incorrect information for
archives that were not recreated at the same time. There is no risk of data loss by this.

--chunker-params will re-chunk all files in the archive, this can be used to have upgraded
Borg 0.xx or Attic archives deduplicate with Borg 1.x archives.

USE WITH CAUTION. Depending on the PATHs and patterns given, recreate can be used to
permanently delete files from archives. When in doubt, use --dry-run --verbose --list to
see how patterns/PATHS are interpreted. See list_item_flags in borg create for details.

The archive being recreated is only removed after the operation completes. The archive
that is built during the operation exists at the same time at "<ARCHIVE>.recreate". The
new archive will have a different archive ID.

With --target the original archive is not replaced, instead a new archive is created.

When rechunking space usage can be substantial, expect at least the entire deduplicated
size of the archives using the previous chunker params. When recompressing expect approx.
(throughput / checkpoint-interval) in space usage, assuming all chunks are recompressed.

If you recently ran borg check --repair and it had to fix lost chunks with all-zero
replacement chunks, please first run another backup for the same data and re-run borg
check --repair afterwards to heal any archives that had lost chunks which are still
generated from the input data.

Important: running borg recreate to re-chunk will remove the chunks_healthy metadata of
all items with replacement chunks, so healing will not be possible any more after
re-chunking (it is also unlikely it would ever work: due to the change of chunking
parameters, the missing chunk likely will never be seen again even if you still have the
data that produced it).

OPTIONS

       See borg-common(1) for common options of Borg commands.

   arguments
       REPOSITORY_OR_ARCHIVE
              repository or archive to recreate

       PATH   paths to recreate; patterns are supported

   optional arguments
       --list output verbose list of items (files, dirs, ...)

       --filter STATUSCHARS
              only display items with the given status characters (listed in borg create --help)

       -n, --dry-run
              do not change anything

       -s, --stats
              print statistics at end

   Exclusion options
       -e PATTERN, --exclude PATTERN
              exclude paths matching PATTERN

       --exclude-from EXCLUDEFILE
              read exclude patterns from EXCLUDEFILE, one per line

       --pattern PATTERN
              experimental: include/exclude paths matching PATTERN

       --patterns-from PATTERNFILE
              experimental: read include/exclude patterns from PATTERNFILE, one per line

       --exclude-caches
              exclude     directories     that     contain     a     CACHEDIR.TAG     file     (‐
              http://www.bford.info/cachedir/spec.html)

       --exclude-if-present NAME
              exclude  directories  that  are  tagged  by containing a filesystem object with the
              given NAME

       --keep-exclude-tags, --keep-tag-files
              if tag objects are specified with --exclude-if-present, don't omit the tag  objects
              themselves from the backup archive

   Archive options
       --target TARGET
              create  a  new archive with the name ARCHIVE, do not replace existing archive (only
              applies for a single archive)

       -c SECONDS, --checkpoint-interval SECONDS
              write checkpoint every SECONDS seconds (Default: 1800)

       --comment COMMENT
              add a comment text to the archive

       --timestamp TIMESTAMP
              manually specify the archive creation date/time (UTC, yyyy-mm-ddThh:mm:ss  format).
              alternatively, give a reference file/directory.

       -C COMPRESSION, --compression COMPRESSION
              select compression algorithm, see the output of the "borg help compression" command
              for details.

       --recompress MODE
              recompress data chunks according to --compression. MODE if-different: recompress if
              current  compression  is  with  a different compression algorithm (the level is not
              considered). MODE always: recompress even if current compression is with  the  same
              compression  algorithm  (use  this  to  change  the  compression level). MODE never
              (default): do not recompress.

       --chunker-params PARAMS
              specify  the  chunker  parameters  (CHUNK_MIN_EXP,  CHUNK_MAX_EXP,  HASH_MASK_BITS,
              HASH_WINDOW_SIZE) or default to use the current defaults. default: 19,23,21,4095

EXAMPLES

          # Make old (Attic / Borg 0.xx) archives deduplicate with Borg 1.x archives.
          # Archives created with Borg 1.1+ and the default chunker params are skipped
          # (archive ID stays the same).
          $ borg recreate /mnt/backup --chunker-params default --progress

          # Create a backup with little but fast compression
          $ borg create /mnt/backup::archive /some/files --compression lz4
          # Then compress it - this might take longer, but the backup has already completed,
          # so no inconsistencies from a long-running backup job.
          $ borg recreate /mnt/backup::archive --recompress --compression zlib,9

          # Remove unwanted files from all archives in a repository.
          # Note the relative path for the --exclude option - archives only contain relative paths.
          $ borg recreate /mnt/backup --exclude home/icke/Pictures/drunk_photos

          # Change archive comment
          $ borg create --comment "This is a comment" /mnt/backup::archivename ~
          $ borg info /mnt/backup::archivename
          Name: archivename
          Fingerprint: ...
          Comment: This is a comment
          ...
          $ borg recreate --comment "This is a better comment" /mnt/backup::archivename
          $ borg info /mnt/backup::archivename
          Name: archivename
          Fingerprint: ...
          Comment: This is a better comment
          ...

AUTHOR