I use [rsync](http://www.samba.org/ftp/rsync/rsync.html) as my primary backup utility as it is fairly efficient at archiving files (NOTE: to backup to fat32 usb drives, make sure `–modify-window=1` is [used](http://ubuntuforums.org/showthread.php?t=451684)). I recently discovered [unison](http://www.cis.upenn.edu/~bcpierce/unison/), and am [using](http://blog.nguyenvq.com/2011/07/18/real-time-file-synchronization-like-dropbox-via-unison/) it for real time synchronization between directories from two Linux computers. I really like it. Because of how well `unison` read more
