Hypothetically, if governments wordwide just suddenly became authoritarian and deleted all records of history, you and some survivors escape to a remote area outside of government control, they all can’t remember much from history (either didn’t pay attwntion in class, or suffers memory loss from the governemtn attacks) and so you are designated as this community’s official historian. How much can you remember? What’s gonna be the official narrative of your little rebel community?
While I understand it doesn’t quite fit the scenario, it does strike me as a good way to preserve “lost information” in a similar situation. Pair that with a solar charger (or even improvise something like a pedal charger), and you’re pretty set for a lot of basic information people would struggle to reconstruct.
Some ebook readers have a microsd card slot, so you could fit an offline copy of Wikipedia on a device with half a year of battery life (in airplane mode)