[nashashmi]

Taking a minute to appreciate the level of long term thinking required for storing data, to plan for 300-500 years into the future, to be able to withstand all kinds of innovations, and survive basic obsolescence.

What is the longest surviving paper medium?

[StilesCrisis]

Dead sea scrolls come to mind, for some values of "survive." And the Book of Kells is in good shape.

[nashashmi]

Longest surviving paper document (as opposed to parchment) https://en.wikipedia.org/wiki/Missal_of_Silos?wprov=sfti1