ZFS doesn't support an arbitrary graph of snapshots, even with cloning. There is a "zfs promote" command that can be used, but can only be used in certain circu

ZFS doesn't support an arbitrary graph of snapshots, even with cloning. There is a "zfs promote" command that can be used, but can only be used in certain circumstances. For example, I wanted to take the latest backup of a system and rsync older and older backups onto that backup, making a snapshot each time. I then wanted the snapshot of the newest data to be the "HEAD". I also wanted to gradually delete the older data. This setup was not possible with ZFS, because the child-parent relationships were in the wrong order. With btrfs it was simple.