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gitlab-backup: Set GZIP_RSYNCABLE=yes so borg can dedup

Merged gitlab-backup: Set GZIP_RSYNCABLE=yes so borg can dedup
gitlab-backup-gzip-rsyncable into master
Merged Evangelos Foutras requested to merge gitlab-backup-gzip-rsyncable into master
  1. Jun 24, 2021
    • Evangelos Foutras's avatar
      gitlab-backup: Set GZIP_RSYNCABLE=yes so borg can dedup · 2222767c
      Evangelos Foutras authored 
      gitlab-backup produces gzipped tarballs that cannot be meaningfully
deduplicated by borg.  This can be mitigated by passing --rsyncable
to gzip.

The above is verified by creating two new borg repositories, adding
the two most recent gitlab.archlinux.org archives to both, with the
difference of re-compressing the tarballs with `gzip -1 --rsyncable`
before adding them to the second repository.

In the first case, the 215.97 GB backup archive gets compressed and
deduplicated down to 176.24 GB. With --rsyncable it gets reduced to
just 12.79 GB. These numbers are for /srv/gitlab/data/backups only,
but the other non-tarballed files get sufficiently deduped already.

Based on the above, I am hoping to see the borg repository for gitlab
shrink over time from the current 3 TB to around 600 GB which is more
manageable.
      Verified
      2222767c