I’ve been thinking about adding this to my “Fuck it, I’ll do it myself” / SHTF pile. I have a spare 10-15GB for a good selection of basic articles (across sciences, history, pop culture trivia etc).

https://get.kiwix.org/en/solutions/hotspots/content-bundles/

https://get.kiwix.org/en/solutions/hotspots/imager-service/

There’s something inherently cool about having wikipedia in a box (yes, you’d likely need to refresh it once a year) but I’ve never heard of anyone actually self hosting a Kiwix instance.