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.TH BORG-RECREATE 1 "2020-12-24" "" "borg backup tool"
.SH NAME
borg-recreate \- Re-create archives
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.SH SYNOPSIS
.sp
borg [common options] recreate [options] [REPOSITORY_OR_ARCHIVE] [PATH...]
.SH DESCRIPTION
.sp
Recreate the contents of existing archives.
.sp
recreate is a potentially dangerous function and might lead to data loss
(if used wrongly). BE VERY CAREFUL!
.sp
\fB\-\-exclude\fP, \fB\-\-exclude\-from\fP, \fB\-\-exclude\-if\-present\fP, \fB\-\-keep\-exclude\-tags\fP
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.
.sp
Note that all paths in an archive are relative, therefore absolute patterns/paths
will \fInot\fP match (\fB\-\-exclude\fP, \fB\-\-exclude\-from\fP, PATHs).
.sp
\fB\-\-recompress\fP 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.
.sp
\fB\-\-chunker\-params\fP 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.
.sp
\fBUSE WITH CAUTION.\fP
Depending on the PATHs and patterns given, recreate can be used to permanently
delete files from archives.
When in doubt, use \fB\-\-dry\-run \-\-verbose \-\-list\fP to see how patterns/PATHS are
interpreted. See \fIlist_item_flags\fP in \fBborg create\fP for details.
.sp
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.
.sp
With \fB\-\-target\fP the original archive is not replaced, instead a new archive is created.
.sp
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.
.sp
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.
.sp
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).
.SH OPTIONS
.sp
See \fIborg\-common(1)\fP for common options of Borg commands.
.SS arguments
.INDENT 0.0
.TP
.B REPOSITORY_OR_ARCHIVE
repository or archive to recreate
.TP
.B PATH
paths to recreate; patterns are supported
.UNINDENT
.SS optional arguments
.INDENT 0.0
.TP
.B \-\-list
output verbose list of items (files, dirs, ...)
.TP
.BI \-\-filter \ STATUSCHARS
only display items with the given status characters (listed in borg create \-\-help)
.TP
.B \-n\fP,\fB  \-\-dry\-run
do not change anything
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.B \-s\fP,\fB  \-\-stats
print statistics at end
.UNINDENT
.SS Exclusion options
.INDENT 0.0
.TP
.BI \-e \ PATTERN\fR,\fB \ \-\-exclude \ PATTERN
exclude paths matching PATTERN
.TP
.BI \-\-exclude\-from \ EXCLUDEFILE
read exclude patterns from EXCLUDEFILE, one per line
.TP
.BI \-\-pattern \ PATTERN
experimental: include/exclude paths matching PATTERN
.TP
.BI \-\-patterns\-from \ PATTERNFILE
experimental: read include/exclude patterns from PATTERNFILE, one per line
.TP
.B \-\-exclude\-caches
exclude directories that contain a CACHEDIR.TAG file (\fI\%http://www.bford.info/cachedir/spec.html\fP)
.TP
.BI \-\-exclude\-if\-present \ NAME
exclude directories that are tagged by containing a filesystem object with the given NAME
.TP
.B \-\-keep\-exclude\-tags\fP,\fB  \-\-keep\-tag\-files
if tag objects are specified with \fB\-\-exclude\-if\-present\fP, don\(aqt omit the tag objects themselves from the backup archive
.UNINDENT
.SS Archive options
.INDENT 0.0
.TP
.BI \-\-target \ TARGET
create a new archive with the name ARCHIVE, do not replace existing archive (only applies for a single archive)
.TP
.BI \-c \ SECONDS\fR,\fB \ \-\-checkpoint\-interval \ SECONDS
write checkpoint every SECONDS seconds (Default: 1800)
.TP
.BI \-\-comment \ COMMENT
add a comment text to the archive
.TP
.BI \-\-timestamp \ TIMESTAMP
manually specify the archive creation date/time (UTC, yyyy\-mm\-ddThh:mm:ss format). alternatively, give a reference file/directory.
.TP
.BI \-C \ COMPRESSION\fR,\fB \ \-\-compression \ COMPRESSION
select compression algorithm, see the output of the "borg help compression" command for details.
.TP
.BI \-\-recompress \ MODE
recompress data chunks according to \fB\-\-compression\fP\&. MODE \fIif\-different\fP: recompress if current compression is with a different compression algorithm (the level is not considered). MODE \fIalways\fP: recompress even if current compression is with the same compression algorithm (use this to change the compression level). MODE \fInever\fP (default): do not recompress.
.TP
.BI \-\-chunker\-params \ PARAMS
specify the chunker parameters (CHUNK_MIN_EXP, CHUNK_MAX_EXP, HASH_MASK_BITS, HASH_WINDOW_SIZE) or \fIdefault\fP to use the current defaults. default: 19,23,21,4095
.UNINDENT
.SH EXAMPLES
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.INDENT 3.5
.sp
.nf
.ft C
# 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
\&...
.ft P
.fi
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.SH SEE ALSO
.sp
\fIborg\-common(1)\fP, \fIborg\-patterns(1)\fP, \fIborg\-placeholders(1)\fP, \fIborg\-compression(1)\fP
.SH AUTHOR
The Borg Collective
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