Of course the first answer, Wikipedia! I have the link!

(Offline Webpage Friendly Kiwix format) 102.62 GB uncompressed ZIM file format https://download.kiwix.org/zim/wikipedia_en_all_maxi.zim

Two problems with Wikipedia 1. It is absolutely full of unnecessary knowledge 2. It contains little knowledge of how to do anything

We'd be in big trouble! All the celebrity bios, corporate history, could probably half that to be essential. That's 50GB left!