This is also a major concern of mine, to the point that I actually considered to start printing the English Wikipedia at home, on very thin paper. Sure, it will take a few years (and probably a few printers) and will occupy most of my basement, but at least I will have access to this knowledge in case another dark age emerges.
I am extremely worried that libraries are now replacing physical books by digital representations. If this is going to continue, there will be a point where the slightest global catastrophe will wipe out most of the knowledge of the past 2000 years.
Where would you get a printed encyclopedia that's current? The only encyclopedia that I've heard of that's still actively being published is World Book Encyclopedia and that's meant for grade school children. Even the Encyclopedia Britannica released its final edition in 2010.
There's a lot of unknown ancient material in the Vatican library. Being all concentrated in one spot, it's extremely vulnerable. Nobody seems to care, though.
I am extremely worried that libraries are now replacing physical books by digital representations. If this is going to continue, there will be a point where the slightest global catastrophe will wipe out most of the knowledge of the past 2000 years.