You must have an internal CD-RW drive or a SuperDrive to use this option.
Backing up files to optical discs (CD or DVD) instead of your iDisk or hard drive makes sense if you need additional backups or if you don't have an extra disk drive. You might not have access to an Internet connection and your iDisk, or your iDisk may not have enough space to hold all your backups. CDs are a good alternative. DVDs (if you have a SuperDrive) are even better since they hold much more data than a CD.
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