

For any machines that are too inefficient to be worth continuing to compute with, you could at least save the power supplies for electronics projects. I’ve got some 12V addressable RGB Christmas lights being powered by an old ATX power supply, for example.

Uh… you do know that people don’t literally save a bunch of Linux ISOs, right? It’s a euphemism for collecting less legit things, like pirated media or porn.
By the time you want to install the same distro again, it’s likely that a new version will be out and you’ll want to re-download it anyway.