77a8603f_ervation__Library_of_Congress___Definition
[Term] Storage: Offline [Definition] 
Any digital storage medium that must first be attached to a computing device before being made accessible to the computing system. Offline storage may be in the form of tape drives, fixed media (CDs, DVDs, flash drives) or hard drives that are not continuously network accessible. Also called removable storage. See also "Nearline Storage" and "Online Storage."
NDSA Levels of Preservation Glossary - National Digital Stewardship Alliance - Digital Preservation (Library of Congress)
Definition