borg rcompress

borg [common options] rcompress [options]
  -C COMPRESSION, --compression COMPRESSION select compression algorithm, see the output of the “borg help compression” command for details.
  -s, --stats print statistics
  -c SECONDS, --checkpoint-interval SECONDS write checkpoint every SECONDS seconds (Default: 1800)

Common options


Repository (re-)compression (and/or re-obfuscation).

Reads all chunks in the repository (in on-disk order, this is important for compaction) and recompresses them if they are not already using the compression type/level and obfuscation level given via --compression.

If the outcome of the chunk processing indicates a change in compression type/level or obfuscation level, the processed chunk is written to the repository. Please note that the outcome might not always be the desired compression type/level - if no compression gives a shorter output, that might be chosen.

Every --checkpoint-interval, progress is committed to the repository and the repository is compacted (this is to keep temporary repo space usage in bounds). A lower checkpoint interval means lower temporary repo space usage, but also slower progress due to higher overhead (and vice versa).

Please note that this command can not work in low (or zero) free disk space conditions.

If the borg rcompress process receives a SIGINT signal (Ctrl-C), the repo will be committed and compacted and borg will terminate cleanly afterwards.

Both --progress and --stats are recommended when borg rcompress is used interactively.

You do not need to run borg compact after borg rcompress.


# recompress repo contents
$ borg rcompress --progress --compression=zstd,3

# recompress and obfuscate repo contents
$ borg rcompress --progress --compression=obfuscate,1,zstd,3