8. Storage Duration and Deletion of the Collected Data <p> We store personal data only as long as there is a concrete purpose for this. The duration of the storage depends on the purpose of the processing, the requirements of the processing, as well as on your and our interests and rights and, if applicable, the interests and rights of third parties. We always store personal data as briefly as possible (principle of data economy data/minimization), but at the same time we observe the statutory requirements which stipulate a minimum retention period (e.g., in commercial and tax law of up to 10 years, Sec. 257 para.