Dragonfly BSD's HAMMER2, when it is even half done (that is, stable for one node), is probably a much better (technical) choice than BTRFS or improving HFS+, an

Dragonfly BSD's HAMMER2, when it is even half done (that is, stable for one node), is probably a much better (technical) choice than BTRFS or improving HFS+, and probably a much better legal choice than ZFS.