In the 20^th century, Archives became museums of obsolete technology, collectors of valuable records in formats no longer commercially viable or practical. This growing list includes wax cylinders, wire recordings, analog audio tapes, audio cassettes, microcassettes, Dictaphone disks, 1” and 2” video reels, U-Matic video cassettes, VHS and Beta cassettes, as well as 8mm and 16mm films.

From the mid-1930s through the late-1980s, 16mm film was a very popular medium for schools, businesses, churches, and parachurch organizations. The Evangelism & Missions Archives has hundreds of movies in these formats (especially 16mm), as well as the production and correspondence files of evangelical film companies. Meant to be shown in church or at church events, these movies were particularly thought to be a means of attracting young people to church.