I use rsyncbtrfs [1] (which I'm also the author of) to auto backup my OS, home and pretty much everything, daily. It's saved my ass on numerous occasions where I've deleted a file by mistake and could go back to the previous night's backup to restore it. Backup is where btrfs really shines. I have some 1200 timestamped directories, each of which represent a snapshot of my data at a certain date. I can just cd into them and look at the files.