I recently lost 2 disks in my 5 disk ZFS RAID-Z array, resulting in an unrecoverable array. I do have a recent backup in the form of ZFS snapshots sent to an external USB drive on a regular basis, so my data loss was minimal. I have replaced the failed disks and am ready to set my 5 disk array back up. MY plan to restore from the backup drive is to take a fresh snapshot of the backup drive and send it to the newly rebuilt array, which will copy all of the data back onto the RAID-Z pool. At that point, I'm obviously going to want to re-implement my backup strategy... and this is where I get confused. Will I be able to send incremental snapshots of the RAID-Z pool directly to the backup drive based of that snapshot I used to restore the data? Or will I need to take a new snapshot of the RAID-Z pool, send that to the backup drive and then take incrementals from there? I have close to 4TB of data here, and copying that over is quite time consuming on this system, so I'm hoping ot minimize the amount of full snapshots I need.