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Definitions of backup:
  • noun:   (computer science) a copy of a file or directory on a separate storage device
    Example: "He made a backup in case the original was accidentally damaged or erased"
  • noun:   an accumulation caused by clogging or a stoppage
    Example: "A traffic backup on the main street"
  • noun:   the act of providing approval and support
  • noun:   a subordinate musical part; provides background for more important parts
  • noun:   someone who takes the place of another (as when things get dangerous or difficult)

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