The Blackout did not destroy ALL electronic records. Some information is kept on alternative sources, like the fragments left from Deckard’s interview with Rachel, on those crystal storage devices. The vault had seemingly billions of records on those glowing discs, a room filled with the crystals, and it’s mentioned…

Wait, what the hell!? You just casually dropped a Blade Runner 2049 spoiler into an article contrasting the original film and novel. There was literally no warning there. That’s just bullshit.