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    Syntax #1 - BACKUP [pathname] drive: [/S] [/M] [/A] [/D:date]

    DOS 2.11 - HARD DISK ORGANIZATION

    (External) Copies one or more files from a hard disk to floppy disks.

            pathname   specifies the file to backup.

            drive      specifies the disk to receive the files.

            /S      copies all files in the specified directory and all files
                    below it.

            /M      copies only files modified since the last backup.

            /A      adds the files to the diskette in the specified drive.

            /D:date copies only those files created or modified on or after
                    the specified date (mm-dd-yy).

    Example:
            backup c:qbasic\*.bas  a:/a

    Syntax #2 - BACKUP [pathname] drive: [/S] [/M] [/A] [/P] [/D:mm-dd-yy]
                [/T:hh:mmx] [/L:filename]

    DOS 3.2 - HARD DISK ORGANIZATION

    NOTE:   See above for brief description of BACKUP...

    NOTE:   The /S - /M - /A - /D:date are the same as for MS-DOS 2.11 Above.

            /P      saves the file in a packed format.

            /T      copies files created or modified on or after the time
                    specified.

            /L:filename creates a backup log entry in the file specified.

    Example:
            backup c: a: /p