I needed somewhere to plant files while I reconfigured my ZFS NAS from raidz1 to raidz2 and added an extra drive to compensate for the loss of space. Suprisingly I got away with it!
Mergerfs is quite useful. Now I have a lot of occasional spare storage and somewhere to put snapshots until I can save up for a proper backup drive.
I’ve tried Snapraid but we didn’t get on, I never got the hang of it and lost data as a result.
I think you can use different size disks with ZFS if you use raid10 for the pairs, but the cost would be to high for me. Did I read somewhere that they were working on a way to use different size disks? That would be useful.
Just to add, I’d like BTRFS to be brilliant, so much interesting potential, but I read its deemed safer to use raid10 rather that any variant of raid5. if you’re ever faced with having to rebuild the array, as others have mentioned. Single use is ok as far as I know.


Home network. The most fun was setting it up and finding out about ZFS, ymmv.
No multiusers, so I use a simple vpn to connect to my services from outside.
Apps use NAS ip address:Port and are easily viewed in a browser once installed.
I don’t need much else so I install services as they catch my interest. Tried Tailscale, now looking at NetBird which might be the way forward as they now have a reverse proxy for testing.
Anything else is a bit too complicated for me to maintain.