Definitions from Wiktionary (backup)

▸ noun:  A reserve or substitute.
▸ noun:  (computing) A copy of a file or record, stored separately from the original, that can be used to recover the original if it is damaged or destroyed.
▸ noun:  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.
▸ noun:  (law enforcement) Reinforcements.
▸ noun:  Any support or extra help.
▸ noun:  (music) Accompaniment.
▸ noun:  Corroboration.
▸ adjective:  Standby, reserve or extra.
▸ adjective:  (computing) That is intended as a backup.
▸ adjective:  Supporting, reinforcing; (music) of or related to accompaniment
▸ verb:  (computing, nonstandard) Alternative form of back up [(idiomatic, intransitive) To move backwards, especially for a vehicle to do so.]
▸ Also see backup

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