A lot. If you want to back up to the cloud, there are so many that offer a basic free service (2GB to 50GB) and other cloud services that will also back up to a HDD you may have at home, as well as to the cloud. Here are some you can check out. MozyHome, Bitcasa, Box, Pogoplug, Cubby and you also have Google Drive, SkyDrive from Microsoft and Amazon Cloud Drive. It depends on your individuals needs and preferences. Some can be set to automatically backup/Sync files, some you have to get involved a little. There are even more than I have listed. Be sure to read the pros and cons with all, don't jump too fast in choosing one.