Even 50 years (laughable for a clay tablet) is still pretty darn long in the tech world. We'll still probably see the entire computing landscape, including the underlying hardware, changing fundamentally in 50 years.
Future-proofing anything is a completely different dimension. You have to provide the independent way to bootstrap, without relying on the unbroken chain of software standards, business/legal entities, and the public demand in certain hardware platforms/architectures. This is unfeasible for the vast majority of knowledge/artifacts, so you also have to have a good mechanism to separate signal from noise and to transform volatile formats like JPEG or machine-executable code into more or less future proof representations, at least basic descriptions of what the notable thing did and what impact it had.