not the best type of mates to have
Did you follow pollushon instructions correctly? It should be working Ok and the game should start playing from your backup copy as long as you made your backup image using the Safedisk 2/3 datatype from the original. If you used some other datatype setting when you made the image it might be more difficult to play the game from the backup. Try and burn it again and make sure all your settings are correct.