[bibaheu]

I simply burn the photos in 100GB M-disc blurays. Then I bury them next to a tree in a zip lock bag.

[soco]

I hope you bury a reader unit as well :) I bought two units of different makes and do small tests like once a year after computer/os updates, just in case...

[bibaheu]

There's plenty of bluray drives still manufactured, mostly on each modern console. I hope I can find a working in 20-30 years, my PlayStation 1 is still working strong :D