Is there a way to automatically save Pages documents copies as PDF on every save? Is there a way to enable Pages (version 10.1 (6913)) to automatically save a copy of the current document as PDF every time I save it to avoid a manual export?
You might be able to use Folder Actions to trigger an AppleScript that creates the  PDF whenever the contents of the folder are changed. The problem may be the fact that the document is still open.
But realistically, you don't have to manually press Save in Pages anyway, so just assign a key command to Export to PDF. You could even use Command S.