Our best answer might be film. Some of it has already survived 80 years. (Micro)film is supposed to last something like 500 years, and it's what Github picked for their Arctic Code Vault. I was curious one time so I looked into it, but it seems like most effort is on converting microfilm to digital, not the other way around.

Anecdotally, the stuff my grandpa filmed on Super-8 is still in nearly perfect condition 65 years later. But most of his 16mm stuff from just a few years earlier than that has vinegar syndrome, so it's not "just film it and you're good"