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4 definitions found
 for backup
From The Collaborative International Dictionary of English v.0.48 :

  backup \back"up\, n.
     1. anything kept in reserve to serve as a substitute in case
        of failure or unavailability of the normal or primary
        object; -- used for devices, plans, people, etc. Also used
        attributively; as, there was no backup for the electrical
        supply; a backup motor; a backup generator.
        [PJC]
  
     2. (Music) a musician or group of musicians accompanying a
        soloist, whether vocalists or instrumentalists.
  
     Syn: accompaniment. [PJC]
  
     3. a person or group of persons serving as reinforcement for
        another or others; as, the policeman called for backup
        when he was fired on.
        [PJC]
  
     4. an accumulation, overflow, or reverse flow (in traffic or
        a liquid flow system) caused by a stoppage or other
        malfunction.
        [PJC]
  
     5. (Computers) A copy of a program or data from a computer
        onto a data-storage medium, usually one that may be
        removed to safe storage at a distance from the computer;
        it is used to preserve data for use in the contingency
        that the original data on the computer may be lost or
        become unusable. A backup that is removed from the
        building housing the computer system (to provide
        protection against loss of data in a disastrous event such
        as a fire) is called off-site backup. Also used
        attributively; as, backup copy.
        [PJC]
  
     6. (Computers) The act or process of creating a backup[5];
        as, they performed a full system backup every weekend.
        [PJC] Backward

From WordNet (r) 3.0 (2006) :

  backup
      n 1: an accumulation caused by clogging or a stoppage; "a
           traffic backup on the main street"; "he discovered a backup
           in the toilet"
      2: 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" [syn: stand-in, substitute, relief, reliever,
         backup, backup man, fill-in]
      3: a musical part (vocal or instrumental) that supports or
         provides background for other musical parts [syn:
         accompaniment, musical accompaniment, backup,
         support]
      4: (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" [syn: backup,
         computer backup]
      5: the act of providing approval and support; "his vigorous
         backing of the conservatives got him in trouble with
         progressives" [syn: backing, backup, championship,
         patronage]

From Moby Thesaurus II by Grady Ward, 1.0 :

  104 Moby Thesaurus words for "backup":
     about-face, about-turn, advocate, agent, alter ego, alternate,
     alternative, amicus curiae, analogy, attorney, back track,
     back trail, backing, backing off, backing out, backing up,
     backup man, champion, change, changeling, comparison, copy,
     counterfeit, deputy, double, dummy, equal, equivalent, ersatz,
     exchange, executive officer, exponent, fake, figurehead, fill-in,
     ghost, ghostwriter, imitation, lieutenant, locum, locum tenens,
     makeshift, metaphor, metonymy, mock, next best thing, paranymph,
     personnel, phony, pinch, pinch hitter, pleader, procurator,
     provisional, proxy, relief, replacement, representative, reserve,
     reserves, reversal, reverse, reversing, reversion, right-about,
     right-about-face, ringer, second in command, second string,
     secondary, sign, spare, spares, stand-in, stopgap, sub,
     substituent, substitute, substitution, succedaneum, superseder,
     supplanter, surrogate, swingaround, symbol, synecdoche, temporary,
     tentative, third string, token, turnabout, turnaround, understudy,
     utility, utility man, utility player, vicar, vicar general,
     vicarious, vice, vice-president, vice-regent, vicegerent,
     volte-face
  
  

From The Free On-line Dictionary of Computing (18 March 2015) :

  backup
  
      ("back up" when used as a verb) A spare
     copy of a file, file system, or other resource for use in the
     event of failure or loss of the original.
  
     The term commonly refers to a copy of the files on a
     computer's disks, made periodically and kept on magnetic
     tape or other removable medium (also called a "{dump}").
  
     This essential precaution is neglected by most new computer
     users until the first time they experience a disk crash or
     accidentally delete the only copy of the file they have been
     working on for the last six months.  Ideally the backup copies
     should be kept at a different site or in a fire safe since,
     though your hardware may be insured against fire, the data on
     it is almost certainly neither insured nor easily replaced.
  
     See also backup software, differential backup,
     incremental backup, full backup.  Compare archive,
     source code management.
  
     (2004-03-16)
  

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