Earlier quoted context omitted.
>Anything critical and entirely irreplaceable goes onto blu-ray disks, because I can't accidentally delete those There's bit-rot though: https://en.wikipedia.org/wiki/Data_degradation#Decay_of_stor...
I'm aware of that too well; blu-ray, however, is slightly better than the predecessors: even the current, non-archival grade single layer Panasonics should - according to some accelerated tests - last 5-10 years. Now, looking at the current ideas from Sony[1], within 8-10 years every data I ever had will need 1 disk, so I'm not worried. [1]: http://www.computerworld.com/article/3057889/data-storage/so...
I've worked in IT for over ten years, and have not once, once seen a blu ray in person, or ever handled a machine capable of reading one. It'd be incredible afraid to have my backups in something that requires some expensive exotic device to be written/read.
You'd be much better off with USB sticks.