After a restart it can happen that your ZFS Pool does not remount automatically. If that happens you can do the following to fix this issue. I have written this hotfix because I ZFS has alot of commands that can import or add a drive but this one did the trick for me. Tested on a Mac Mini running ZFS 2.1.0.
$ sudo zpool import pool: backupraid id: 12345678901234567890 state: ONLINE action: The pool can be imported using its name or numeric identifier. # Take the ID for the final import $ sudo zpool import 12345678901234567890
After that your Pool should be remounted again and you can use it like before.