I learned my lesson when my desktop imploded my junior year of college...right before all my term papers and portfolios were due...I didn't sleep for nearly a week while I totally redid everything. I passed all my classes, but I got a mild case of selenium poisoning from all the energy drinks I was drinking (started turning green, believe it or not). Now I back up everything. I even keep some stuff backed up on the PC at my mother's house (tax stuff and the like).