Curious about how many backup their computers. As a graduate student, it is imperative that I keep my stuff. A collegue had his Master's thesis on a flash drive which got washed in his laundry. Luckily he had emailed it to his professor, so he had a sort-of backup. I backup my home folder to an external hard drive weekly and also back it up to Amazon S3. I have pictures that are priceless. My music is also really important to me. I'm not really worried about the entire hard drive as I can easily reinstall the operating system and copy my personal files over.