DVD files if gets scratched than you can't access them any more. if you have important files in your DVD than create copy of all files on mac. this will help if you lost any item from DVD than you access backup file.
It is important to copy and backup DVD disc for data security, distribution and sharing. Aiseesoft, 4Videosoft, iSkysoft, Wondershare, iMacsoft, Ainsoft Mac DVD Copy tool allow to copy and backup DVD disc in few simple steps./