I want to maintain a working backup of my project's source files to fall back upon when I make a bold revision in code. How do I save those backup files in codewarrior? It seems that just copying the project directory and working out of those files/directories results in changes that are reflected back to the original files/directories I copied them from. I was fooled in the thought (for years now) that just making a copy of the project directory would leave me with a "saved and working" original project folder, but codewarrior changes those supposily "saved and working" original source files too. What's the fix?