In Germany there is a last significant population on the Rhine island of Ketsch. This site is to be protected through the network of genetic conservation areas in Germany.
https://genres.de/fachportale/kultur-und-wildpflanzen/in-situ-erhaltung-von-wel/genetische-erhaltungsgebiete-wildrebe/

Moreover, from the last growing sites of the wild vine, vines have been transferred to the German Genebank Vines and will be preserved there in the long term. In this way, wild vine shoot is available to scientists and breeders for research, breeding and training purposes.
https://genres.de/fachportale/kultur-und-wildpflanzen/genbanken/deutsche-genbank-reben/