The term Datensparsamkeit is taken from German privacy legislation and describes the idea to only store as much personal information as is absolutely required for the business or applicable laws. Customer privacy continues to be a hot topic. Companies such as Uber are apparently collecting highly personal customer data, as well as being quite lax with security. This is a disaster waiting to happen. Following datensparsamkeit or using de-identification techniques even in jurisdictions where it is not legally mandated, can allow you to reduce the information you store. If you never store the information, you do not need to worry about someone stealing it.