SOS Online Backup has great security options, from the usual password to privately managed keys and triple-layer 256-bit encryption. It will duplicate your online backup to a local hard drive, or another computer or NAS box on your local network for additional safety and quick restore. It's also easy to use if you're a reasonably knowledgeable user, and quite affordable for modest amounts of data. We like SOS a lot, and most tech-savvy users will as well. Be sure to check our online backup roundup for more reviews of the competition.