Critical data for the average user typically does not require much space, so the cost of storage overhead in a mirrored ZFS pool is not too bad. RAIDZ is much

Critical data for the average user typically does not require much space, so the cost of storage overhead in a mirrored ZFS pool is not too bad. RAIDZ is much more cost efficient when you need to reliably store large content that isn’t really critical. As you’ve noted, media is one good example of this. In my case, I’m using a RAIDZ1 vdev of 3 disks, with the understanding that things could go south during a resilver.