As long as by regular backups, you mean MINIMUM once a day (more the better, autosave only goes back so far), then yes that would be “manual” source control. 
I have been trying perforce but just can’t get used to it for some reason… I decided to switch back over to SVN server / ToroiseSVN combo, I also use Ankhsvn with visual studio, I guess I’m just to used to it now to change.
It may not be as tightly integrated with the engine, but it works for me! 
Edit: Also, it can be the same computer, but make sure it is a different hard drive! An external drive would be a good purchase to save the data to if you don’t have a second computer around.