Definitions
noun
a musical part (vocal or instrumental) that supports or provides background for other musical parts
noun
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”
noun
someone who takes the place of another (as when things get dangerous or difficult)
noun
an accumulation caused by clogging or a stoppage
“a traffic backup on the main street”
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