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I don't have a testing environment, but essentially all my services are on docker saving their data in a directory mounted on the local filesystem. The dockerfile reads the sha version of the image from an env file. I have a shell script which:
if a new Docker version is broken rolling back is as simple as copying the old version in the env file and recreating the container. If data gets corrupted I can just copy the last working status from an old snaphot.
The whole os is on a btrfs volume which is snapshotted regularly, so ideally if an update fucks it up beyond recovery I can always boot from a rescue image and restore an old snapshot. But I honestly feel this is extra precaution: in years that I run debian on all my computers, it never reached the point of being not bootable.