Define apocalypse, in the terms of what will remain at the very least. All technology (including discarded old computers) will be unusable? All digital media wi

Define apocalypse, in the terms of what will remain at the very least. All technology (including discarded old computers) will be unusable? All digital media will be erased? All printed books (specially the IT ones) will be burned down? All the people with present knowledge of those and related technologies will die out, or the time of recovery to think about building back will be too far into the future? Anyway, can’t stop thinking in the Delorean’s chip of Back to the Future 3.