Either documents or pictures. I have a hard copy of nearly all of my music (yes, I still buy CDs), so that doesn't really matter. Programs can be reinstalled. Saved games...they're just games after all, many more important things in life. I have some documents that are important but waaaay more pictures. Speaking of which, I need a new hard drive....either another 1TB or a 2TB...make it two of them for RAID 1, actually.