Занятная штука этот Corvus, оказывается. https://en.wikipedia.org/wiki/Corvus_Systems :
Certain models of the drives offered a tape backup option called "Mirror" to make hard disk backups using a VCR, which was itself a relatively new technology. A standalone version of "Mirror" was also made available. Data was backed up at roughly one megabyte per minute which resulted in five or ten-minute backup times. Tapes could hold up to 73MB. Even though Corvus had a patent on this technology, several other computer companies later used this technique.
Едва ли что-то из этого выжило до наших дней, конечно.