Turn Off Auto-Save in OS X Mountain Lion
If you don’t like the Auto-Save feature of OS X, you’ll be pleased to discover that turning it off is just a matter of checking a settings box from OS X Mountain Lion onward.
- Open “System Preferences” from the Apple menu and click the “General” pane
- Check the box next to “Ask to keep changes when closing documents”
- Close out of System Preferences
With automatic saving turned off, you will be asked to save files manually each time you attempt to close a file or document that has been modified, just like past versons of Mac OS X.
This setting is much easier to use than disabling the feature in Lion through defaults writes commands, and unlike in Lion it doesn’t disable Versions too.
Just remember, with this feature turned off you will need to save documents yourself again. If you’re already accustomed to the automatic saving on file change behavior, it’s probably best to leave enabled.