I haven't tried that backup utility yet. I'm frankly a little nervous to trust it with valuable data. I'll run it and something based on rsnapshot for the near term. Now I just have to figure out if I've got enough external drives for that, or do I need to buy more.

I'll likely first try to run things so that the btrfs snapshots are running over the Internet, which will really cut down on the time and bandwidth needed. And as a backup use rsnapshot locally.