Dan Sherman: "Why not take an ad out in your local paper or even go door to door (�we�re in the neighborhood� kind of thing) and advertise your services to set up a computer backup system for people so they won�t lose any of their data if their computer goes down? You would be absolutely AMAZED to know how many people do not have their computers backed up. Almost every single house you go to is a potential customer."
My friend did this with a business called Systems on CD. I don't think there was any money in it at the time, since it was so labour-intensive. You could probably automate it a bit more easily now.