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Definitions of back up:
  • verb:   make a copy of (a computer file) especially for storage in another place as a security cop
    Example: "You'd better back up these files!"
  • verb:   move backwards from a certain position
  • verb:   establish as valid or genuine
    Example: "Can you back up your claims?"
  • verb:   give moral or psychological support, aid, or courage to
  • verb:   become or cause to become obstructed

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