FastBack is a software application developed in the late 1980s and early 1990s for backing up IBM PC and Macintosh computers. It was originally written by Fifth Generation Systems Inc, a company located in Baton Rouge, Louisiana. When the company wanted to expand into the Apple market they purchased and rebranded a product from TouchStone Software Corporation.

A fastback is a car body style whose roofline slopes continuously down at the back. The word can also designate the car itself. The style is seen on two-door coupés as well as four-door sedans.