I just recently spent 3 days backing up all my photos and LOs! I have them all on my external hard drive anyway, but have backed them all onto disc. I made a disc (sometimes 2!!) for each month of the years I have been scrapping, and saved my Los and photos from each month to a different disc(s). I also have a book for each year, which I am altering into a disc case with a slip-in page for each disc. I am also planning on backing up the discs themselves and storing them at my dad's house just in case they fail or anything happens to the contents of my house!
Next, it will be my kits - need to take a long holiday from everything else to get all of them backed up!