Some of you maybe familiar with Bazzell, a former FBI agent turned OSINT specialist and privacy expert, his podcast is covering "self hosting" services for the next few episodes.
The first episode of the series did not cover much other than the reasons why he wants to dive into this. The second covered using kiwix to mirror larges sites like wikipedia, wiktionary, ifixit, project gutenberg, etc, as well as using calibre to index ebooks.
I imagine future episodes will be oriented slightly towards keeping offline data specific to some of the topics he covers (so breach data, other things that help online investigations, having local resources for privacy reasons), but all the same I figured it would be interesting to the community.
I would think this would be a kind of question for an OSINT community. It would be worth reposting the question there.