FWIW does any of it remain on archive.org? They have some really great collections on there, and writing on digital archiving, like how to preserve CDs as best as possible (spoiler: the brand of CD is a large factor).
That's well and good for the _current_ ability to potentially find some old media, but regarding GP's point about digital data being fickle over long time-spans, Archive.org is only one hack/fire/solar-flare/DDOS/etc. away from being gone (potentially forever). They were recently hacked, thankfully the group who claimed responsibility weren't trying to destroy data.
> A single copy of the Internet Archive library collection occupies 145+ Petabytes of server space -- and we store at least 2 copies of everything).
Thankfully they have a few backups around the world, but there are still plenty of plausible events which could render the data useless. In contrast, physical mediums like books, vinyl records or microfilm/microfiche can last for hundreds of years.
