How many movies have Gerhard Krüger and Helmuth M. Backhaus collaborated on?

They have worked on 5 movies together! Their first movie together was Am Sonntag will mein Süßer mit mir segeln gehn (1961) and was their highest rated movie together. They have not worked together since Wenn man baden geht auf Teneriffa (1964). They are most known for their comedy films together.