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  1. [noun] an accumulation caused by clogging or a stoppage; "a traffic backup on the main street"; "he discovered a backup in the toilet"

  2. [noun] someone who takes the place of another (as when things get dangerous or difficult); "the star had a stand-in for dangerous scenes"; "we need extra employees for summer fill-ins"
    Synonyms: stand-in, substitute, relief, reliever, man, fill-in

  3. [noun] a subordinate musical part; provides background for more important parts
    Synonyms: accompaniment, musical accompaniment, support

  4. [noun] (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

  5. [noun] the act of providing approval and support; "his vigorous backing of the conservatives got him in trouble with progressives"
    Synonyms: backing, championship, patronage


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