From the inability of NASA and the DOD to reverse engineer their own tech from the 60s/70s, to the alleged humor that Blizzard has a bounty for anyone who can provide them with the original WoW code
Media storage is only as good as the hardware and the networks they support, time, corruption, and meat-space disruption will make it inevitable that vast amounts of data will be lost
'Internet never forgets' my ass
I've heard it said that we're living through what will one day be considered a dark age precisely because, despite our thoughts contrary wise, all of our recordings and texts and pictures keep being stored in highly ephemeral storage media. Instead of like stone tablets or books, we got stuff encoded on floppies and magnetic tape or not encoded on anything physical in "the cloud."
A Canticle for Leibowitz but the monastery is devoted to burning DVDs of Shrek 3. They don't know what it means or if it really happened, only that it is history worth preserving.
The knowledge on how to decode a medium encoded within that medium itself. A system that only exists because it exists and can only continue to exist with it's continued existence.