back-up
  後援,備份
  backup
  後備
  backup
  後備; 備用; 備份; 備製
  back-up
  備份 備用
  backup
  備份 備用
  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 man, fill-in]
       3: a subordinate musical part; provides background for more
          important parts [syn: accompaniment, musical
          accompaniment, 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: computer
          backup]
       5: the act of providing approval and support; "his vigorous
          backing of the conservatives got him in trouble with
          progressives" [syn: backing, championship, patronage]