A rebalance means that every file on the filesystem will be rewritten. This is drastic, and I'd rather perform such an operation on an image copy. This is one

A rebalance means that every file on the filesystem will be rewritten. This is drastic, and I'd rather perform such an operation on an image copy. This is one case where ZFS is absolutely superior; if a drive goes offline, and is returned to a set at a later date, the resilver only touches the changed/needed blocks. Btrfs forces the entire filesystem to be rewritten in a rebalance, which is much more drastic. I am very willing to allow ZFS mirrors to be degraded; I would never, ever let this happen to btrfs if at all avoidable.