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1 definition found
 for differential backup
From The Free On-line Dictionary of Computing (18 March 2015) :

  differential backup
      A kind of backup that copies all files
     that have changed since the last full backup.  Each
     differential backup will include all files in previous
     differential backups since the full backup so to restore a
     version of a file, you only need to search the full backup and
     the relevant differential backup.
     Some systems support differential backup by associating an
     "Archive" flag with each file and setting this flag whenever
     the file is modified to indicate that it should be included in
     the next backup.  A differential backup does not change this
     flag, whereas an incremental backup resets it.

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