Deadlift is the #1 back exercise.
Upper back Rack pull, Barbell row, Single arm row, T-bar row, Chin up, Pull up, Lat pulldown, Chest supported row, Cable row, Static hold, Farmers walks.
Lower back Goodmornings, Rumanian deadlift, Stiff legged deadlift, Reverse hyper, Hyperextension, Squatting wide, Pullthrough.