Hi - we've just got a new MacBook Pro and I am copying over photos from our PC. We will wipe all of them off the PC as we'll get rid of that, and will store all photos on Mac with backup on our external hard drive. But for wedding, baby photos etc., we'd quite like to have a 3rd backup on DVDs. So how do I go about doing this with a Mac? Do I need special software or is it as simple as just copying the files onto a DVD?