Recent versions of the Mac OS have decided that you weren't really smart enough when it came to saving your files. When you went to save a new version of a file, you'd be presented with options like Duplicate, Revert, and Move To. I (and many others) found them terribly confusing.
Now with Mac OS 10.8.2 you can get the old commands back… the return of the Save As command:
"- Adds an option to discard the changes in the original document when choosing - Save As"
This is useful in the following scenario.
- You can choose to open an existing document.
- Modify it and make changes.
- Choose File > Save As (hold down the option key to access it).
- Save the file under a new name. The original file is closed without any changes being made to it.