Bernoulli Syquest ZIP, etc. Various formats are not interchangeable. Solution to transfer large files between non-networked machines. Data Transfer is faster than tape. Allows off-site storage of essential business information.
Tape is very slow, capacity of individual tapes is very low.
Cost of large HDD is now so low that backup requires multiple tapes. This allows up to 8GB of data on 1 tape. Very useful upgrade to extend the life of fast 386 machines. A printed circuit board you install in your PC to provide functions not included in Motherboard. Adds functions not found on the motherboard, or updates functions provided on the motherboard.