As I said before btrfs has raid support. That is just the newest thing I learned about it. What is also great is its support for subvolumes and snapshots. Since snapshots are copy-on-write they are instant and only cost storage capacity once you start changing files. snapshots are read only by default, which is good for backups, but can of course be duplicated to standard subvolumes, which ca be mounted at boot as root file system. So with a small amount of bash scripting and a cron job you can get a local timemachine like backup system. The script could also take care of adding entries to your boot manager. And you don't even have to revert to a state where your system worked an throw all changes out the window, you can keep those in a snapshot.
But since local snapshots are a little useless when the disk fails one needs external backup. btrfs can transfer diffs between snapshots :)
Yep, thats it, but aren't the simple "hey something works" reads the best?
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