The Internet Archive discovers and captures web pages through many different web crawls. At any given time several distinct crawls are running, some for months, and some every day or longer. View the web archive through the Wayback Machine.
Well, the Internet Archive is now officially a library according to the State of California! It turns out that to receive a particular kind of federal funding, you have to have your state sign off that you are a library.
With a minimum amount of back and forth (including their saying "we have not evaluated something like the Internet Archive before") we were given the approval.