Microsoft DOS backup command
MS-DOS application that enables users to backup their data on their computer.
The backup command is an external command available in the below Microsoft operating systems. With MS-DOS 4.0x and earlier the backup.com external file was used. In the last version of MS-DOS (version 5) to support the backup command it used backup.exe as the external file.
Note: MS-DOS 6.0, 6.2, 6.21, and 6.22 users use the msbackup command. However, this file is still available to these users on the MS-DOS 6.0 and 6.22 supplemental disk.
MS-DOS 2.x - 5.x syntax
BACKUP [Source:\Path\Filename] [Target:] [/s] [/m] [/a] [/d:date] [/t:time] [/f:size] [/L:LogDrive:\Path\Log]
|Source:\Path\Filename||The source, path, and filename of the location of the file that you want to backup.|
|Target:||The target drive for the backup file.|
|/s||Makes a backup of all files, directories, and subdirectories in the specified source location.|
|/m||Backup all files that have changed since the last backup.|
|/a||Adds a new backup file to existing backups instead of overwriting them.|
|/d:date||Backup files that have been created or modified since the date specified.|
|/t:time||Backup files that have been created or modified after this time.|
|/f:size||Create backup files in a specific size so they can be saved to an external storage such as a floppy disk drive.|
|/L:LogDrive:\Path\Log||Create a log of the backup and specify the location of where the log is to be saved.|
backup c:\work\*.* d: /s
The above example would create a backup of all the files and subdirectories in the work directory and save the backup to the d: drive.