Stop “Save As” From Changing Original File in OS X Mountain Lion
“Save As” is back in OS X Mountain Lion and Mavericks, but many users have complained of how it modifies the original file in addition to the newly saved file, thereby defeating the purpose of how many people use Save As. If this bothers you, you’ll be pleased to discover that from OS X 10.8.2 onward, there is now an easy option to toggle that prevents Save As from altering the original file when it’s called.
Note that if you do not see this feature or option, you need to update OS X to a more modern version.
- Open a file and choose “Save As” as usual
- At the Save dialog window, uncheck the box for “Keep changes in original document”
- Save as usual
As long as that checkbox is not active, the original file will not be modified.
Though there isn’t a system-wide adjustment to control this behavior in all apps, you do only have to uncheck it once per application. In other words, if you uncheck it in Preview for one file, it will be automatically disabled for every other file opened in Preview app, unless it is checked again of course.
Many users thought this was a bug when it was first discovered, but it’s actually just a part of the Versions feature of OS X. If you don’t like the way it behaves, just toggle the ‘changes to original document’ option to OFF and proceed as usual.