At least with the laptop being so old the disk of it was small by today's standards (only 40GB), so most media I usually stored elsewhere after watching (though I lost some recent stuff), and I'm fairly sure I have all of my digital fanart as copies somewhere or at least most of it (on the net are only the low res versions, the files I keep are much better), because I'm slightly better about backups for that. I mostly miss the recent version of my todo file, some drafted posts, and various such accumulated files (like some recs I planned and a never finished thematic list for stories with ordinary Atlantis personnel), also a bunch of fanfic and fanart I've saved over the years, some of which isn't online anymore, and screencaps as well as other art references. :(

Though right now more than the data I miss having a laptop, because I used to be able to snuggle and play with my rats, sitting in a comfortable place, while reading fanfic or watching tv on that laptop, and now I only have my old desktop. Though on the bright side at least I do have another computer, I wouldn't want to imagine the withdrawal symptoms otherwise.

I guess we live with hard disk failures like in the past it used to be that libraries burned down all the time with only some of the books having copies elsewhere...