CSSC

Somewhat surprisingly, git is actually really easy for the really easy things, particularly if you've configured it with your username already for other projects, and are only worried about making bad changes (rather than preserving the data from disks dying or an "rm -rf ."). You just need "git init" the first time and "git add .; git commit" whenever you want to keep a state. You only need a server (or even filesystem storage outside of the directory) if you want to publicize your projects, and you only get anything complicated going on if you have parallel development.