With great power comes great responsibility. The big data movement gave us tools to gather and process huge amounts of data. Recent incidents show that these opportunities come with a cost. Concentrating heaps of personal information in one place threatens people's privacy. More is not always better - or to be clear: more is sometimes quite dangerous. This talk explores ways to deal with this situation. The concept of Datensparsamkeit introduces a mindset everybody can take away from this conference into the real world.