My solution is RAIDZ5 and storing the backup on LTO6 tape with parity/erasure code. I think the fact that scrub times take 24 hours even on 16TB drives is already over the safety margin. If a drive failure happens, the first thing I’ll do to run a manual diff backup which should take a fraction of the time and then run the ZFS resilver.
I’m beginning to see why SSD RAID is being considered now. My guess for HDDs in enterprise is that a RAID 15 (I made this up) would be considered. What I mean is data is stored on two identical servers each running RAID5 or 6. Off the shelf solutions like Gluster exist and that seems to be gaining traction at least according to Linus Tech Tips.
Doesn’t Windows 10 already do that? I could never get the freaking thing to leave my files behind and disable itself.
Windows 10 LTSC for the win if you have software you can’t yet abandon.