In the Time Machine pane of System Preferences, add any ZFS dataset.
For the first backup to that dataset, the operating system will:
- create a sparse bundle disk image (…
.sparsebundle) at the root of that dataset
- attach the image, after which you'll see a volume named Time Machine Backups.
For each subsequent backup to that dataset, the OS will:
- attach the image, after which you'll see the Time Machine Backups volume.
Time Machine routines with ZFS are similar or identical to the routines that apply when backing up to a device – such as an Apple Time Capsule – that uses AFP.
How can one recover from TM after new/reinstallation? New OS installation knows nothing about ZFS to TM image is unreachable.