Add rsnapshot post pointing out Walter Werther's Btrfs tricks.

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+[rsnapshot][] is a backup utility that uses [rsync][] to backup files
+over the network.  Backups to my external [Btrfs][] drive were
+dragging, with a lot of time and processor power spend running `cp`
+and `rm`.  With a [COW][] filesystem like btrfs, this is wasted
+processor time and disk activity, so I migrated to using Btrfs
+snapshots instead.  Walter Werther has a [good write up][WW].  The
+idea is to configure rsnapshot to use scripts that wrap `btrfs`
+instead of your system's `cp` and `rm` programs.  Walter's put the
+relavant script on [GitHub][]: [cp][] and [rm][].
+
+[rsnapshot]: http://www.rsnapshot.org/
+[rsync]: http://rsync.samba.org/
+[Btrfs]: https://btrfs.wiki.kernel.org/
+[COW]: http://en.wikipedia.org/wiki/Copy_on_write
+[WW]: http://wwerther.de/2011/10/migrate-rsnapshot-based-backup-to-btrfs-snapshots/
+[GitHub]: http://github.com/
+[cp]: https://gist.github.com/1306185
+[rm]: https://gist.github.com/1306189