Can't agree. Open-e is configured to use NIS. We have several hundreds of users, and we have daily changes on this database --really!!! (research environment close to a university)
Thus, Open-e MUST be able to work with NIS. It isn't a solution for us to keep out (actually) two Open-e systems manually consistent to NIS.
the problem is solved now. I didn't realize that rsync is used in _daemon-mode_, and therefore it needs double colon in the remote address. Furthermore, the NAS resource name must be given instead of a filesystem's path.
wrong:
rsync (options) ./ user@DSS:/share/resource
correct:
rync (options) ./ user@DSS::resource
Things are working well now. Thanks to all who helped!