
1) Backup software for Windows 2) Car body style 3) DC Comics superhero 4) Fictional turtle
Found on
https://www.crosswordclues.com/clue/fastback

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. ==History== Starting in the 1930s, designers began using elements of aircraft aerodynamics to smooth out the boxy-looking automobile. Some designs that we...
Found on
http://en.wikipedia.org/wiki/Fastback
No exact match found.