Do you back them up on a USB drive that lives in your top drawer? Do you keep an encrypted file somewhere in the cloud? Do you print them on special paper and store them in a Norway Vault? Maybe you launch your private keys into helical orbit as a gravity powered time-lock safe?
When you die, what happens to your private keys? How will your family access the value that you’ve been dutifully holding for state collapse and zombie apocalypse?
hehehe