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What does backup mean?

Looking for the meaning or definition of the word backup? Here's what it means.

Noun
  1. A reserve or substitute.
  2. (computing) A copy of a file or record, stored separately from the original, that can be used to recover the original if it is destroyed or damaged.
  3. An accumulation of material caused by a (partial) obstruction or (complete) blockage of the flow or movement of the material, or an accumulation of material that causes an overflow due to the flow being greater than the maximum possible flow.
  4. (law enforcement) reinforcements
Adjective
  1. Standby, reserve or extra.
  2. (computing) That is intended as a backup.
Verb
  1. Misspelling of back up.
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