to put this "opinion" to rest, i will have to quote, from the excellent
" ...BACKUPS, ARCHIVES..." ( by Plotinus Veritas )
at
https://discussions.apple.com/docs/DOC-6031
When it comes to long-term data protection, there is optical and there is NOTHING else, period. While modern notebooks and macbooks have forgone, for the most part internal optical DVD/CD readers/writers, this is most entirely due to the fact that commercial videos and movies have gone to online rentals and Itunes purchases, additionally nearly all software now is online purchase and download. The other reason for this is the removal of a 'high' failure point of an internal optical drive which is both mechanically complex, prone to dust on the laser diode lens due to users inserting dusty disks / media, and that the superdrive is not currently capable of fitting in the super-slim form factor machines such as the current Imac, Macbook Pro and especially the Macbook Air. However external USB DVD burners and readers are going nowhere anytime in the foreseeable future,... and until a new optical technology emerges for data preservation, DVD writers aren’t going anywhere.
oh yes, and here's also the excellent Ken Watson ( in his "All about digital photos" )
( http://www.rideau-info.com/photos/index.html )
CDs and DVDs have a shelf life (20 to 50 years depending on who you believe) which is sufficiently long that when the next inexpensive storage standard comes along (likely high capacity flash memory) you can move your archived images to that new medium.