Since I'm an aspiring minimalist (it's a struggle), I've been trying to implement the paper free lifestyle described in this Lifehacker article. I've been scanning in my old paperwork and shredding it and saving everything to my tiny USB key. I've been a little paranoid about what would happen if I lost it or it got wet, but I do back it up to two separate harddrives just in case. This particular one is 8 GB (which would be enough to hold a lifetime of data) and it's shock and water resistant.