Example embodiments relate to decentralised data storage. One embodiment includes a method of storing data within an external light network. The external light network includes a plurality of decentralised EDP units. Each of the decentralised EDP units belongs to a light. Each EDP unit has a communication means. There is at least one sensor arrangement respectively assigned to at least one of the EDP units. The method includes arranging a first EDP unit recording data. The method also includes storing a data set that includes the data recorded by the sensor arrangement of the first EDP unit or that has been generated from these data, distributed over a number of the decentralised EDP units. Further, the method includes at least partially deleting the data set after the distribution of the data set on the first EDP unit.