Library Disappears

[TheDreadPirate]

Can you share how Jellyfin is configured in TrueNAS? Specifically where you've mounted /config and /cache. It sounds like you've co-mingled /config and /cache in the same folder instead of creating separate folders for each. If my assumption is correct, the cache cleanup job is essentially wiping out any permanent config files that are not currently in use. So things like your databases will remain, but library configs and images will be "cleaned up"