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Backup compression option

Matthias Käppler requested to merge github/fork/soullivaneuh/compression into master

Created by: soullivaneuh

As requested here, this PR add a compression option for backup.

TODO list:

  • Compression settings on gitlab.yml
  • Implement compression commands on backup create
  • The restore method should guess compression type and extract it to avoid BC break
  • Improve clean old backups method to fetch compressed packs
  • Check backup upload method to fetch compressed packs
  • Check for backup test and update it
  • Check if docs could be updated (upgrade)
  • Give some benchmark with dev env
  • Update CHANGELOG

This feature would be useful to save some space especially for big Gitlab platforms.

Some benchmark, done on my workstation with default dev env and data:

Extension Time Size
.tar 0m7.746s 101M
.tar.gz 0m10.158s 96M
.tar.bz2 0m20.678s 96M
.tar.xz 0m35.414s 80M

This benchmark use default compression level.

Tell me if I missed some check on todo list!

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