My step-dad decided to re-format my hard drive back when I was in high school one time before I converted everything over to my laptop.
For this reason, I bought an 80 gig external hard drive, so I can do everything with more ease.
...Then my 80 gig hard drive got 0wned by a power surge.
Now I have two copies of the important stuff... One goes on my new laptop, and the other goes on my 500 gig hard drive
...Most annoying lesson ever learned