There's a nice little tutorial on Justin Schwalbe's blog for using a simple script to backup a few folders to a Dropbox backup folder every day. Why would you do this? Well, let's say you aren't always able to connect to a hard drive for Time Machine, but you have a couple of document folders you want to make sure are backed up off site every day. If you are traveling but have internet access, this script plus Dropbox will save your bacon -- or your files, at least.
Note that you should be comfortable with bash scripting to successfully implement this backup solution. You can, of course, also keep folders in D
