this post was submitted on 19 Jun 2023
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Hi all

I'm running several docker containers with local persistent volumes that I would like to backup. I haven't found an easy method to do so.

What do you use / recommend to do that? AFAIK you can't just rsync the volume directory while the container is running.

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[–] [email protected] 19 points 1 year ago* (last edited 1 year ago) (7 children)

Use bind mounts instead of docker volumes. Then you just have normal directories to back up, the same as you would anything else.

In general, it's not a problem to back up files while the container is running. The exception to this is databases. To have reliable database backups, you need to stop the container (or quiesce/pause the database if it supports it) before backing up the raw database files (including SQLite).

[–] [email protected] 2 points 1 year ago (3 children)

Exactly the reason why i always exchange the volumes in any compose file with bind mounts.

Also you don‘t have the provlem of many dangling volumes

[–] [email protected] 1 points 1 year ago (2 children)

I don't even understand what the advantage is to using volumes rather than mounts? So I too always use mounts.

[–] retrodaredevil 1 points 1 year ago

I'm not sure either. The only thing I could come up with is that with volumes you don't have to worry about file ownership. That's usually taken care of for you with volumes from what I understand.

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