When printing statements, there is an option to exclude those who receive electronic statements 

Also described as, "Is there a way for us to know if a parishioner has gone online and printed their annual giving statement so we don’t have to duplicate or waste funds mailing them?"

When setting up contribution statements, make this choice on the lower right of the Options screen. The option says, "Include givers who have opened electronic statements." You may leave this box unmarked if you want to exclude those who have opened electronic statements from getting a printed copy.