I get the same feeling. That's why I always have this idea in the back of my head that I should learn to make a computer from the sand on a beach in case I'm ev

I get the same feeling. That's why I always have this idea in the back of my head that I should learn to make a computer from the sand on a beach in case I'm ever marooned on an island on an alien planet. But I recognize that it's entirely impractical to start from literally nothing. I also keep around my old computers and/or make sure I have emulators that can run my old stuff. E.g. a TRS-80 emulator for the Basic II programs I first learned to write. Or a Mac OS 9 emulator to open Claris Works 4 files I wrote in high school. I rarely use such things, but I feel better knowing my data is not truly lost.