I’m a big fan of “sparse bundle” disk images in Mac OS X. They allow me to create encrypted repositories for valuable data that can efficiently be rsync-ed between disks and don’t waste a lot of space. So I thought I’d write up a bit on what they are and how they can be used.
Encryption is an important tool for individuals regardless of what they’re storing. Given the recent security failings of Dropbox, I highly recommend using methods like this to secure your important data before using the service!