Etymology
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backup (n.)

"a standby, a reserve," 1952; see back up (v.). Specific reference to computing is from 1965.

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Definitions of backup

backup (n.)
an accumulation caused by clogging or a stoppage;
he discovered a backup in the toilet
a traffic backup on the main street
backup (n.)
someone who takes the place of another (as when things get dangerous or difficult);
Synonyms: stand-in / substitute / relief / reliever / backup man / fill-in
backup (n.)
a musical part (vocal or instrumental) that supports or provides background for other musical parts;
Synonyms: accompaniment / musical accompaniment / support
backup (n.)
(computer science) a copy of a file or directory on a separate storage device;
he made a backup in case the original was accidentally damaged or erased
Synonyms: computer backup
backup (n.)
the act of providing approval and support;
From wordnet.princeton.edu