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
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.