Rick Prelinger has a lot of media to store, not only at his house, which he says is overrun with books, movies, and the like, but also at the Prelinger Library he founded in San Francisco with his wife, Megan, in 2004. The pair has collected 30,000 volumes of books and periodicals and another 30,000 bits of print ephemera like maps and pamphlets. When you consider that the Prelinger Archives, founded in 1982, has already relocated 200,000 cans of film—–movies, instructional films, anything really—–to the Library of Congress, you start to get a sense for both Prelinger’s yen to amass and his contribution to posterity.