What would be the best way to implement an LTO tape-based backup system on a ZFS fileserver? I've got about 6TB that need to be backed up on a daily basis, along with an existing HP 1840 LTO4 tape drive and a bunch of tapes.
I've already got the ZFS doing automatic snapshots every day, but now want to add a layer of offline storage to this. Ideally, the resulting system would implement some sort of father/son rotation system, so I have daily diff tapes for the last two weeks along with a full backup every week.
Reading around, I've seen that some people have used a combination of zfs send / dd / tar to achieve this, but it's not clear to me exactly how this should be implemented.
I've just read about
zfs send -i which supposedly sends the increment between two different snapshots. While I feared this whole exercise might make me write some scripts, that should make the diff backup task a little easier. Still no idea how to handle tape changes via a script though.