Use DirSync Pro to back up and synch Scrivener projects…

A free tool I find useful for backing up files to an external driver or USB stick is DirSync Pro:

Setting up a synchronization job takes a bit of fiddling, and one does well to verify that a given synchronization job is doing the right thing, but after that’s been done DirSync Pro provides a a quick and easy way to keep my Scrivener projects in synch across two computers. I simply — and reliably — use DirSync Pro to backup to and update from a USB stick after every Scrivener session.

Versions are available for Windows, Mac, and Linux, too…

Cheers & hope this helps,