Not a single condensed source, but there's an abundance of this type of content on Youtube, from both hobbyists and professionals.
What I'm thinking is a real-life open-source "tech tree".
Books printed on acid-free paper or clay tablets do not copy as easily as bits, but are a lot more durable.
An alternative is to make lots of digital copies of sites like these. That’s cheaper than printing them, but a bit less durable.
I wouldn’t know which of these would be the statistically optimal (as in: information isn’t destroyed, will be found by those who need it, and can be read) method, but I don’t think YouTube is.
.. who makes their money monetizing the content of others.
I respect this guy for staying off the commercialized hosting site and having such a simple, functional website. That is even before my kudos to his work toward duplicating technology from the ground up, and then documenting both success and failure. The latter is something many programmers, including myself, tend to defer until the end of time.