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If I'm running Ubuntu server can I backup my docker files and will Debian find my mdam raid without issue?
For mdadm, it stores the metadata on the drives themselves. As long as your os is separate, yes, it should be just fine and detect automatically. After install it should just be a mdadm --assemble --scan and off to the races.
That said, I will always recommend backups. You never know what will happen.
In terms of docker, yes you can back things up and move them over. That said I recommend having your docker contents that need to be persistent as part of a mount somewhere, so that instead of needing to copy them around, you just have a compose that points to a mount.
Makes backups easier too.
Yeah, I'm thinking of getting a sata ssd and putting it in one of the hot swap bays as I have 6/8 filled with 14tb HDDs is raid 6. Then putting all the docker stuff there so it's not on the boot nvme.
A solid call either way, easier to manage and safer imo