Dropbox is a file sync app that installs a lightweight client on your PC, monitors a "My Dropbox" folder on your drive, and automatically syncs files in that folder online and to any other computer you have Dropbox installed on. It also makes sharing files with family, friends, co-workers, projects, etc super easy. There are plenty of other similar file sync apps, ones I've tried are Microsoft Live Mesh , ZumoDrive , and some of these others . I've found all these either