I remember a time when computers weren't even sold with CD-ROM drives, let alone recordable CD-ROM drives. Back then, everything was done with a floppy disk. Now, CD-ROM drives have given way to DVD-ROM drives. It is hard to buy a computer today that doesn't even include a recordable DVD-ROM drive.
While affordable Blu-ray recordable drives are a few years off, today the more practical optical choice is that of the DVD. In this plan I talk about using only optical discs for backing up your data.