You seem to not know much about playing backups on your 360. To get 360 Backups playing you flash your DVD Drive.
First go find out what DVD Drive you have. If you have a Lite-on you'll need to find a guide on spoofing because lite-ons are currently un flashable. If you have anything other than a lite-on then you will be able to play it. A guide for flashing can be obtained
here
To find out what DVD Drive you have you can either: 1) Open your 360 and look at the sticker on top of your drive or 2) Take off your faceplate and look at the hole in the front of the DVD drive.
Circuit board and red wire= Samsung:
Black plastic divot = Hitachi
White wires and empty space = Benq
I'm not sure about the Lite-on one. If you have a different looking hole that those 3 you may have a lite-on. And considering you have JUST got your 360 the chances of you having a lite-on it very, very high.