

Okay so not critical, just mildly inconvenient if lost.
I would just keep one copy in RAID, and for the most important stuff a second copy locally or in the cloud. Yes, RAID is not backup, but a disk failure is probably the most likely failure scenario. Corruption is the second most likely.
So you’re building your own images? I’m sure there’s a way to build, transfer, and run an image. But you might just set up a local registry. Or just throw them up on a free registry like GitHub.