DOS Commands II (Alphabet B)


         (External – DOS 2.0 and above)
Backs up one or more files from one disk to another.
BACKUP source destination-drive: [/S] [/M] [/A] [/F[:size]]
  [/D:date[/T:time]] [/L[:[drive:][path]logfile]]

  source             Specifies the file(s), drive, or directory to back up.
  destination-drive: Specifies the drive to save backup copies onto.
  /S                 Backs up contents of subdirectories.
  /M                 Backs up only files that have changed since the last
  /A                 Adds backup files to an existing backup disk.
  /F:[size]          Specifies the size of the disk to be formatted.
  /D:date            Backs up only files changed on or after the specified
  /T:time            Backs up only files changed at or after the specified
                     Creates a log file and entry to record the backup



       (Internal – DOS 2.0 and above)

      Sets or clears extended CTRL+C checking.


Type BREAK without a parameter to display the current BREAK setting.
Source: Wikipedia
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