Fix the “iTunes could not back up the iphone because it has not been set up yet” error
If you suddenly get the “iTunes could not back up the iphone because it has not been set up yet” error, well fret not, the fix for this is really easy. In fact, it’s kinda stupid too. Apparently this may happen when you update your iPhone to a new iOS version. It happened to me after updating to iOS 9.
The fix? Just change your iPhone’s language and your iPhone should now backup properly again. Really. It’s that Simple. If you don’t know how to change the language of your phone, the following video would guide you all the way.
Let me know if this works for you too.