Provided you don’t have version control at play (and if you do, then why bother with the extra backups), you can do a zip folder of the complete project, rename the zip backup to whatever date/versioning you want to call it & haul it back to your c:\ drive. This is the method that Peter Grainge advocates on his site for simple sharing of projects – I use the same technique to swap one of my projects back and for with another writer in Pakistan.
Back in the day when I was in the corporate world, I installed a CD burner in my PC. I created a new folder for each day and at day's end I would copy the project to that folder.
Given today's technology, I'd probably use a USB stick or a small portable USB drive to do the same thing.
As for Jeff and asking about source control and if you have it, why bother. Well, all I can say is that source control lives on a server. And those have also been known to fail. There's nothing like having an ability to recover at your own pace and not be forced to halt work and be left twiddling your thumbs while you wait for the powers that be to restore operation! Makes you look that much better to the boss, eh?
Oooh, thumb-twiddling because of an IT failure! Best times I’ve ever had at the office ;>)