I was just reading some of Rackhim‘s posts. He's the author of the recent EmacsCast. The one on backups is quite interesting. I use Arq (Thx @fonnesbeck!) daily since 5 years or so and I have been happy with that only one solution to backup my personal and work-related data. I no longer use cloud fronts like Dropbox, except for already anonymised stuff I don't get care enough to bother with privacy.