Apple's Time Machine keeps daily (or more frequent within a given day) snap shots of all of your folders.[1] Also, in any native OSX app each "save" works like

Apple's Time Machine keeps daily (or more frequent within a given day) snap shots of all of your folders.[1] Also, in any native OSX app each "save" works like a git commit, you can browse all "versions." [2] Combined, these native OSX features do exactly what you want. [1] http://support.apple.com/en-us/HT201250 http://support.apple.com/en-us/HT201250 [2] http://support.apple.com/en-us/HT202255 http://support.apple.com/en-us/HT202255