Data preservation means archiving them in a sustainable way. Publishing research data you can see as sharing them on a structural basis with the public.
Research data is often regarded as the crown jewels of science. It forms the basis of the results of scientific work. The quality of research results is also determined by the possibility of verification by means of the underlying datasets (see Netherlands Code of Conduct for Research Integrity, 3.2 art. 12a). Besides that, scientific development will benefit from sharing and reuse of research data. Good preservation forms the basis of verification, sharing and reuse of the research data.