this post was submitted on 26 Nov 2023
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How to access all files in docker volumes for backups? (feddit.de)
submitted 11 months ago* (last edited 11 months ago) by [email protected] to c/[email protected]
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I am using restic for backups. I would like to use a non-root user to backup my docker volumes. As the files in the volumes have very different access rights and groups, accessing them is difficult without root rights.

Chowning the files doesn't help sustainably, as new files are created with a different group again.

What recommendation do you have to smoothly backup files from the docker volumes?

Tags #restic #backup #docker

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[–] [email protected] 1 points 11 months ago (1 children)

You didn't mention how big those volumes are and how frequently the data changes.

Assuming it's not that much data:

  • use tar to archive each volume first, while using proper options to preserve permissions and whatever else is important for your usecase
  • use restic to backup those archives
  • use a proper pruning strategy to not let your backups get too big:
    • I'm not that familiar with restic, but maybe you can backup those archives separately and apply a more aggressive pruning strategy just for them
    • simply might be needed, cause deduplication (AFAIK) might not be that great with backing up archives
    • but maybe if the volume data and the resulting archive doesn't change that often, deduplication would be sufficient even with a not so aggressive pruning strategy
[–] [email protected] 3 points 11 months ago

Restic uses smart Delta backups, creating a tar before the restic process would defeat the purpose. The permission issue is the same, as I need to have access to the Files either way.