Recently I was wandering if there is someone or some group preserving , collecting , organizing and publishing all the knowledge of mankind ever created throughout its existence so that if ever mankind faces the 6th mass extinction we don’t have to reinvent the wheel and can have a kick start to our new post apocalyptic civilization .
Check out this book: https://en.m.wikipedia.org/wiki/The_Knowledge:_How_to_Rebuild_Our_World_from_Scratch. It analyses that precise question in the first chapter. The author argues that even though Wikipedia is probably the closest thing there is, there is a clear lack of practical knowledge that will be essential in the situation that you are describing. Science progress heavily relies on industrial progress, and even if you know how to build something that doesn’t mean that you can do it, as there are other things that are required first.
Damn that sounds like interesting book to read. Got to get a copy