From its beginning ADP invested effort into development and strengthening of relationship with researchers - data depositors. The effort was concentrated on the promotion of data services and presenting advantages of data depositing. On the other hand we invested into assuring high quality research: by selection and evaluation of research and its data. Since the policies of research funding agencies are changing (due to requirement of international community and H2020) in the way that open access to research data is becoming a requirement and researchers are becoming more and more motivated to deposit their data, the archives are approaching new challenges. The aim of this presentation is to show (1) the development of the relationship ''ADP – data depositors'' from the beginning , (2) to evaluate the current situation (3) and to establish what are the challenges we will have to deal with.