I have similar thoughts.
There is evidence of catastrophic solar eruptions in the ice cores of Greenland and Antarctica. Radioactive isotopes created by nova events. However, the half life of those isotopes indicates that they came from our star, the sun.
One physicist calculated that the radiation burst was twice the lethal dose for a human. Half of the mega fauna became extinct over three continents. Mammoths, et al, had survived millions of years through multiple ice ages, super volcanoes, etc.
Our ancestors in caves survived
I notice a convergence of prophecies from the Bible and predictions of what a micro nova would create. For example, in a micro nova the sun would blow off its outer shell. This material would condense into impactors from tiny to mountain size. Hence, “one third of the stars fell from the sky” and “a great mountain fell into the sea”.
Is it possible that the visions and prophecies warn that each cycle is destruction is worse?
Rather than pyramids, I suggest a printing press to create readable copies of important books on clay tablets. Fired into ceramic. Distributed libraries.
Don’t forget seeds. Thousands of years of selecting the varieties best for our use. Genetics is information.
There is a “doomsday” seed vault in Sweden - tunneled far into a mountain. Perhaps they would allow a 6-foot tall pyramid of information as well.
“Gee Frank - we have all of these containers with little things in them. What do you think they are? What should we do with them??”