You can make a copy of an existing board file and save it under a different file name. For example, you might want to save a new copy if you are creating a new board that is a variation of an existing board and want to retain the original design in case you want  to revert to it later.

alt To save an existing file under a different name:
  1. Choose File | Save As.... A dialog box appears.
  2. In Save in choose the folder where you want to save your new file. 
  3. In File Name type the new file name.
  4. Click Save.