My situation is as follows: before I got my Mac, I was using a 120GB WD Passport for backup for my girlfriend and I. However, with the Mac, I have to use the WD as a dedicated backup on Time Machine. So basically, I need a cheap, small (no more than 20GB) external backup drive for her iTunes, Documents, Pictures, etc... on her Dell. Any advice? I seriously don't need to go out and spend $100 on a damn 120GB HD when she needs about 7 GB total, and I'm all taken care of. Any advice?