If Tomestones would be able to archive primal geometries, I'd expect the Allagans would have already done so. They have way better computing power and data storage methods then we do, and yet Siri (one of the major developers of the art) was concerned that Summoning as an art form would die out without any Primals being summoned. Even the defense node that he developed towards the end of his life still needed to kill us to get a hold of our geometry...