I am guessing, but many of us still use CDs / DVDs (/BluRays?) to make backups. It's cheap. Lasts long.

Write once has some security benefits as well!

> Lasts long

My CD backups lasted about 10-12 years before the silver started peeling off the discs :(

Yeah, learnt the hard way to have backups in multiple medias and that you have to refresh / re-copy your backups every 4-5 years. Wish we had consumer tape drives so that it could be once every 10 years or so.