Reading this thread makes me think about archiving my code too. I have backups of my project folders going back to the 90s when I started programming. But I often delete node_modules and other build artifacts before archiving because that stuff takes up so much space.
But maybe it’s worth going through and actively and explicitly downloading all those dependencies too. Who knows when npm will get hacked again, or old package versions will get yanked. Disk space is cheap. I’ve written a lot of code over the years. It would be nice to know it all still runs.