Re: in fairness
It would not be difficult to make a computer controlled machine that would automatically mill the words of a document into stone slabs - and add photographed signatures if requited. Storing them in a filing system that was easy to access might be a problem.
Though these days I would venture to suggest that storage on conventional digital media, with many copies distributed over many different locations in the World, and refreshed by copying to replacement storage media every decade or so would seem to provide an everlasting archive that would have far better disaster recovery qualities than vellum stored in a non-fireproof or bomb-proof building.