Manuscript Unit staff update records in the microfilm database, which is managed by Access Services, in order to ensure continued access to films after collections are processed, for both research and security purposes. 9.4.2.1 Microfilm to Remain Available for Reference Use 9.4.2.2 Microfilm Retained as a Security Backup Only ‹ 9.4.1. Deciding Whether or Not to Withdraw Microfilm from Reference Use up 9.4.2.1 Microfilm to Remain Available for Reference Use ›