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snap · shot   (snāpshot')

   –noun

1. Computer Science

   1. A copy of a set of files and directories as they were at a particular point in the past;
      
      

   2. An instantaneous function of presenting a copy of the filesystem as if it was frozen in a specific point in time; a copy or duplicate version, esp. of a file, program, or entire computer system, retained for use in the event that the original is in some way rendered unusable.

   adj.   Extra; standby, mirror: 24/7 availability