Quote Originally Posted by si_the_geek View Post
Source Safe is a good version control (aka "code backup") system, which lets you easily compare code files to previous versions (which could be used for undo's, but not easily), lets you have multiple people work on the same project at the same time, and much more. It does sound like you've got it installed already.

In terms of the amount of undo's that the IDE gives, I've never seen a limit - except for the last point that you saved the project.
I don't think that's true. Create a new project and add a, b, c, … z on separate lines. If you then try to undo you can only undo about 20 of them.