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111 lines
3.3 KiB
Groff
111 lines
3.3 KiB
Groff
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.TH "BORG-COMPACT" "1" "2025-05-05" "" "borg backup tool"
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.SH NAME
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borg-compact \- Collect garbage in repository
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.SH SYNOPSIS
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.sp
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borg [common options] compact [options]
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.SH DESCRIPTION
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.sp
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Free repository space by deleting unused chunks.
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.sp
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borg compact analyzes all existing archives to find out which repository
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objects are actually used (referenced). It then deletes all unused objects
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from the repository to free space.
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.sp
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Unused objects may result from:
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.INDENT 0.0
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.IP \(bu 2
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borg delete or prune usage
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.IP \(bu 2
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interrupted backups (maybe retry the backup first before running compact)
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.IP \(bu 2
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backup of source files that had an I/O error in the middle of their contents
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and that were skipped due to this
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.IP \(bu 2
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corruption of the repository (e.g. the archives directory having lost
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entries, see notes below)
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.UNINDENT
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.sp
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You usually don\(aqt want to run \fBborg compact\fP after every write operation, but
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either regularly (e.g. once a month, possibly together with \fBborg check\fP) or
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when disk space needs to be freed.
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.sp
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\fBImportant:\fP
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.sp
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After compacting it is no longer possible to use \fBborg undelete\fP to recover
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previously soft\-deleted archives.
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.sp
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\fBborg compact\fP might also delete data from archives that were \(dqlost\(dq due to
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archives directory corruption. Such archives could potentially be restored with
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\fBborg check \-\-find\-lost\-archives [\-\-repair]\fP, which is slow. You therefore
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might not want to do that unless there are signs of lost archives (e.g. when
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seeing fatal errors when creating backups or when archives are missing in
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\fBborg repo\-list\fP).
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.sp
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When giving the \fB\-\-stats\fP option, borg will internally list all repository
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objects to determine their existence AND stored size. It will build a fresh
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chunks index from that information and cache it in the repository. For some
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types of repositories, this might be very slow. It will tell you the sum of
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stored object sizes, before and after compaction.
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.sp
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Without \fB\-\-stats\fP, borg will rely on the cached chunks index to determine
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existing object IDs (but there is no stored size information in the index,
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thus it can\(aqt compute before/after compaction size statistics).
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.SH OPTIONS
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.sp
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See \fIborg\-common(1)\fP for common options of Borg commands.
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.SS options
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.INDENT 0.0
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.TP
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.B \-n\fP,\fB \-\-dry\-run
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do nothing
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.TP
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.B \-s\fP,\fB \-\-stats
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print statistics (might be much slower)
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.UNINDENT
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.SH EXAMPLES
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.EX
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# compact segments and free repo disk space
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$ borg compact
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.EE
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.UNINDENT
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.UNINDENT
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.SH SEE ALSO
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.sp
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\fIborg\-common(1)\fP
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.SH AUTHOR
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The Borg Collective
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