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);
backup (n.)a musical part (vocal or instrumental) that supports or provides background for other musical parts;
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;
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