Problem: You tried to save a copy of a document using the "Save As..." menu command, but Apple removed that option when they introduced Lion (Mac OS X 10.7+). The command is missing in Mountain Lion (10.8) and Mavericks (10.9), as well.
Solution: Apple quietly added back that option in Mountain Lion (and it carried over to Mavericks). If you hold down the Option key and click on the File menu, the "Save As..." menu item will appear.
