As you probably know, the Long Now foundation has wrestled with the problem of extended time period preservation of physical buildings. In the video linked below, they discuss how ancient people attempted to carry knowledge through the generations. Some of my favorites: the stone markers for the high water mark of Tsunamis, and the temple that is physically rebuilt in exact duplicate every 20 years.

https://www.youtube.com/watch?v=nphxoUxSvgY