How To Backup ABTF

Sorry if this has already been asked but I need some information on how to backup my game data - I have a iPhone 5.I have read that you can use the game centre on iphone but then I have also read people saying that game centre does not backup your progress.can anyone confirm the best way to backup my game data? I have spent a lot of time playing and don't want to loose it.I don't have facebook so cannot backup to that as another option.if there is no where to backup the files for you is there a way to manually backup the required files?thanks a lot