When I find incredible in depth content that I plan to read later, my first step is always to drop it into archive.org, and then to bookmark the original link. That way if you're perusing later on and some links have died or been moved, you can always recover the content you want. Plus, it's archived for everyone else on the Internet which is a net benefit.

I donate to them yearly for being such a crucial piece of Internet infrastructure (in the historical, not literal, sense)