Software's intangibility will be its downfall when our modern society eventually collapses.
I hope your predictions bring similar joy to future readers in the decades, centuries, and millenia to come.
Apparently it has to do with using a certain type of volcanic ash in the concrete...
I am assuming you are thinking of 2000, though, and only mistyped 2020 because... well, that one was weird, but only a year ago.
Collapse is not a singular event at a fixed point in time like the start of a war would be, it's a process.
Such a shame!
This is a present from a small, distant world, a token of our sounds, our science, our images, our music, our thoughts and our feelings. We are attempting to survive our time so we may live into yours - President Jimmy Carter
Barring that, I'm guessing the equivalent of stone tablets, or the golden record are the best bet. I wouldn't place any bets on anything that requires magnetism or electricity to survive in open space for long enough to matter. Like, platter bit-flips due to radiation from outer space are a thing, and current leakage would eventually render something like SSDs unreadable.
So hard copy for earth, radio and hard copy for the universe?