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It's a really simple script.
Everything is deployed with a docker compose, and all the docker volume data are bind mounts and, for example, a Jellyfin install would have everything in /stacks/jellyfin.
The backup script makes a tarball of each service individually (and stops the stack if there's anything in there doing database things or anything else that might end up being inconsistent by just archiving the filesystem), and uploads them to a S3 storage provider AND burns them to a BluRay.
The recovery script does the opposite: it downloads and unarchives the data.
As long as you're on Linux and have Docker, it should just magically work.
I see! Thanks, will try to back up my docker compose services this way.
If you write the script yourself, just make sure you test it a couple of times, and preferably with different datasets from different runs.
I found some edgecase stuff that would have prevented a restore even after I had tested it successfully (some permission issues due to changes in containers and whatnot were resulting in less than the expected data being archived and restored) a couple of times.