Ask HN: How to download, archive and search your favorites in your own library

I want to remember as much as possible as quickly as possible. One of the ways I remember stuff is to save amazing articles I read as favorites. The idea is, if I need to refresh that knowledge I go to that article. There are two issues: 1. I don't have a local copy. 2. There are too many good educational resources / articles that I read. Solving 1 is doable. But how do I solve 2? I have so many things on security, math and other stuff that I read or saw throughout the years that I don't even remember what I have. My idea to counter this is to create a personal search engine. A mindmap might work as well. I'm not fully sure what the best approach is, but to create a personal search engine would be handy anyway. So I was wondering, does anyone know about an app that is able to save your favorites in such a way that it also downloads it to a computer and adds it to a local search engine that you also have running on your computer? And my second more broad question is: how would you solve this problem in general?