Hoooo...boy. That would definitely be cause for all manners of panic. Been there (sort of) done that, when a piece of hardware failed lass than half a day after creating a crypto account. Fortunately, I remembered that I had "stored" them as an email to myself until I could get to a place with a printer and thumb drive... so I could go to my online email from a different machine and retrieve them.

Glad it all turned out OK in the end! Ultimately, our keys aren't 100% safe anywhere, as thumb drives can be lost, hardware can fail, pieces of paper thrown away, cloud-based vaults hacked. We just have to find the level of risk we're OK with and go with it.