I've been using Time Machine for several years and I feel good about have current backups. Recently I've given some thought to this approach as the end all solution. What happens if someone breaks into my place and steels my Mac and USB drive, or if there is a fire? My backups are gone! I decided to supplement my backups with off site storage. I've just started using Backblaze. So far it seems good and I've read good reviews. The first two weeks are free, then $5- a month. Just thought I'd throw this out there to see what others are doing for peace of mind that they have a solid back-up solution.