
Backup a fixed disk to the floppy diskette(s) in the specified drive.

BACKUP d:[path][filename[.ext]] d:[/S][/M][/A][/D:mm-dd-yy]

options:
  /S  - Backup all subdirectories.
  /M  - Only save files modified since the last backup.
  /A  - Add to the files already present on the backup diskette.
  /D: - Only backup files modified after the date specified.

*  Files saved with the BACKUP command MUST be copied back to the fixed disk
   using the RESTORE command.
