MS-DOS 6.22 Backup Utility for Tape Drives

This article examines how system backups were handled on magnetic tape drives under MS-DOS 6.22. While MS-DOS 6.22 included a dedicated backup tool called MSBACKUP, the operating system notably lacked native support for magnetic tape media, requiring users to rely on specialized hardware drivers and third-party software solutions to create tape backups.

The Built-In Tool: MSBACKUP and Its Limitations

MS-DOS 6.22 shipped with MSBACKUP.EXE (and its Windows counterpart, MWBACKUP.EXE), a utility licensed from Symantec based on the Norton Backup engine. While it replaced the older, command-line BACKUP.EXE utility with a graphical menu system, Microsoft specifically stripped out tape drive routines from this release.

As a result, MSBACKUP natively supported only:

  • High-density and double-density floppy diskettes
  • Secondary local hard drives
  • Mapped network drives

If a system administrator attempted to configure MSBACKUP to detect a magnetic tape unit—such as a QIC (Quarter-Inch Cartridge) or SCSI drive—the utility would fail to recognize the device as a valid target.

How Tape Backups Were Achieved in MS-DOS 6.22

Because MS-DOS 6.22 lacked native tape drive commands, backing up to magnetic tape required proprietary third-party utilities and dedicated device drivers.

1. Manufacturer-Bundled Software

The most common approach was using the utility provided directly by the tape drive manufacturer. These programs included custom DOS executables that directly communicated with the drive controller:

  • Colorado Memory Systems: Provided software such as Colorado Backup for DOS for their popular Jumbo and Trakker tape drives.
  • Conner Peripherals: Included Backup Exec for DOS to manage QIC and SCSI tape units.
  • Iomega: Supplied dedicated DOS tools for their Ditto tape drives.

2. Commercial Backup Suites

Users seeking enterprise-grade features purchased full retail packages of backup software that retained the tape drivers omitted from the DOS-bundled versions:

  • Norton Backup (Retail Version): Unlike the trimmed-down MSBACKUP in DOS, the standalone commercial release supported standard tape interfaces.
  • Central Point Backup (PC Tools): Offered direct support for popular tape drives and controller cards.

3. Driver Configuration

Using tape drives under MS-DOS 6.22 also required loading device drivers via the CONFIG.SYS or AUTOEXEC.BAT configuration files. SCSI-based tape drives typically required an ASPI (Advanced SCSI Programming Interface) manager—such as Adaptec's ASPI4DOS.SYS—alongside target drivers to enable communication between the MS-DOS environment and the physical tape hardware.