Remove outer casing from bacon, if necessary. Place bacon in a lightly greased 9-inch square baking pan; pour beer over bacon. Bake, uncovered, at 350° for 15 minutes; baste once with pan juices.
Combine cider, sugar, mustard, and cloves in a medium mixing bowl; stir until sugar dissolves. Pour cider mixture over bacon; bake an additional hour, basting often.
Transfer bacon to a warm serving platter; slice and serve immediately with pan juices.