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this post was submitted on 18 Nov 2023
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My docker containers are all configured via docker compose so I just tar the .yml files and the outside data volumes and backup that to an external drive.
For configs living in /etc you can also backup all of them but I guess its harder to remember what you modified and where so this is why you document your setup step by step.
Something nice and easy I use for personal documentations is mdbooks.
Ahh, so the best docker practice is to always just use outside data volumes and backup those separately, seems kinda obvious in retrospect. What about mounting them directly to the NAS (or even running docker from NAS?), for local networks the performance is probably good enough? That way I wouldn't have to schedule regular syncs and transfers between "local" device storage and NAS? Dunno if it would have a negative effect on drive longevity compared to just running a daily backup.
If you've got a good network path NFS mounts work great. Don't forget to also back up your compose files. Then bringing a machine back up is just a case of running them.