you must provide a LOT mor einformation if you expect help.
what disc are you backing up?
what programs are you using?
what versions of these programs?
what type of media are you backing up to?
what is the rated speed?
what speed did you burn at?
what is the type and model of the device you're playing it back on?
will it play back on your computer?
please provide more information so forum members can assist you. just saying "my dvds won't play" does not provide adequate information.