Coming soon to April's TrueNAS SCALE release, dubbed 'Fangtooth' The latest version of OpenZFS offers RAID expansion, plus ...
When I use sudo zfs get all, I see that both my old pool (data) and my newly created pool (backup) are on version 5, which I think refers to the zfs version, not the zpool version.
The only issue with the GNOP solution is that the pool you create can never be expanded if you upgrade the ZFS version beyond what FreeBSD supports. Attempting to add a new vdev to an existing 4 ...