[modzilla]

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

[2] http://support.apple.com/en-us/HT202255

[LarryMade2]

Similar in Linux is Back In Time

http://backintime.le-web.org/

[mushly]

Very cool, looks like I may get a Mac soon then :)