Indeed. The BBC’s Domesday book was put on a pre-CD glass based optical medium which should last forever, but they managed to lose reading equipment for it, and

Indeed. The BBC’s Domesday book was put on a pre-CD glass based optical medium which should last forever, but they managed to lose reading equipment for it, and a huge digitization effort from the 80s would have been lost (they published a call for help, and eventually someone found a reader in their garage.... but it was a close call)