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(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" an accumulation caused by clogging or a stoppage; "a traffic backup on the main street"; "he discovered a backup in the toilet" the act of providing approval and support; "his vigorous backing of the conservatives got him in trouble with progressives" a subordinate musical part; provides background for more important parts 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" |
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