JF Server storage config advice?

[TheDreadPirate]

For Jellyfin's app data, just making regular backups is the preferred method to survive hardware failures.

For your media, you'd have to use, preferably, ZFS RAIDZ1 or 2. ZFS RAIDZ1/2 does not rely on a hardware controller and can be imported into a new system if you had to migrate the hard drives or rebuild the OS, or move the drives to a new NAS enclosure.

Not sure if your NAS can do that or not. I know for certain that Synology supports ZFS raid levels with parity. QNAP, Asustor, and UGreen almost certainly support ZFS raid as well.