The Archive is best known for its preservation of the ephemeral expanses of the World Wide Web, available through its one-of-a-kind archive/search engine, the Wayback Machine. But this is just one facet of its collection: Working with museums, libraries, and individual donors and contributors, the Archive has amassed more than 145 petabytes of material (if you took more than 4,000 digital photos every day for the rest of your life, you might end up with 1 petabyte). Much of this material is obsolete or out of print — books, microfilm and microfiche, old software, video games, obscure VHS tapes, TV news programs, historic radio shows, and hundreds of thousands of concert recordings.