ion Sciences] 
n., A copy of all or portions of software or data files on a system kept on storage media, such as tape or disk, or on a separate
system so that the files can be restored if the original data is deleted or damaged. [Computer and Information Sciences] 
v., To make a copy of all or portions of software or data files on a system on storage media or on a separate system for safety
purposes. [Computer and Information Sciences] 
n., A duplicate copy of all or portions of software or data files on a