I need to backup about 12 GB onto DVD. Obviously this will span onto about 3 of them. Can anyone recommend some software which will let you select certain directories to burn onto multiple DVD's ?
If you're comfortable with the command line, you can create a disk image of the directories you want backed up, then use a command-line program called hdiutil to split the resulting disk image into 3 parts before burning each image to a DVD. You'll need to have free space on your hard disk of twice the size of the files you're backing up with this method - if you're backing up 12 GB of data, you'll need 24 GB of scratch space.