borg/docs/man/borg-compact.1

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.TH "BORG-COMPACT" "1" "2025-06-18" "" "borg backup tool"
.SH NAME
borg-compact \- Collect garbage in repository
.SH SYNOPSIS
.sp
borg [common options] compact [options]
.SH DESCRIPTION
.sp
Free repository space by deleting unused chunks.
.sp
borg compact analyzes all existing archives to find out which repository
objects are actually used (referenced). It then deletes all unused objects
from the repository to free space.
.sp
Unused objects may result from:
.INDENT 0.0
.IP \(bu 2
borg delete or prune usage
.IP \(bu 2
interrupted backups (maybe retry the backup first before running compact)
.IP \(bu 2
backup of source files that had an I/O error in the middle of their contents
and that were skipped due to this
.IP \(bu 2
corruption of the repository (e.g. the archives directory having lost
entries, see notes below)
.UNINDENT
.sp
You usually don\(aqt want to run \fBborg compact\fP after every write operation, but
either regularly (e.g. once a month, possibly together with \fBborg check\fP) or
when disk space needs to be freed.
.sp
\fBImportant:\fP
.sp
After compacting it is no longer possible to use \fBborg undelete\fP to recover
previously soft\-deleted archives.
.sp
\fBborg compact\fP might also delete data from archives that were \(dqlost\(dq due to
archives directory corruption. Such archives could potentially be restored with
\fBborg check \-\-find\-lost\-archives [\-\-repair]\fP, which is slow. You therefore
might not want to do that unless there are signs of lost archives (e.g. when
seeing fatal errors when creating backups or when archives are missing in
\fBborg repo\-list\fP).
.sp
When giving the \fB\-\-stats\fP option, borg will internally list all repository
objects to determine their existence AND stored size. It will build a fresh
chunks index from that information and cache it in the repository. For some
types of repositories, this might be very slow. It will tell you the sum of
stored object sizes, before and after compaction.
.sp
Without \fB\-\-stats\fP, borg will rely on the cached chunks index to determine
existing object IDs (but there is no stored size information in the index,
thus it can\(aqt compute before/after compaction size statistics).
.SH OPTIONS
.sp
See \fIborg\-common(1)\fP for common options of Borg commands.
.SS options
.INDENT 0.0
.TP
.B  \-n\fP,\fB  \-\-dry\-run
do nothing
.TP
.B  \-s\fP,\fB  \-\-stats
print statistics (might be much slower)
.UNINDENT
.SH EXAMPLES
.INDENT 0.0
.INDENT 3.5
.sp
.EX
# compact segments and free repo disk space
$ borg compact
.EE
.UNINDENT
.UNINDENT
.SH SEE ALSO
.sp
\fIborg\-common(1)\fP
.SH AUTHOR
The Borg Collective
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