Rsync to my NAS

I am using a EX2Ultra and would like to rsync from a Windows client to the NAS.
Have been using DeltaCopyRaw successfully on other systems, but now I am stuck.
How can I do this ?
If I enable transfer through SSH, the application hangs forever.
Without SSH, I am running into auth problems.The user listet in rsyncd.secrets on the NAS, is root + an encrypted password I do not know.
This file cannot be changed, as it is overwritten when the NAS starts.
What can I do ?

There are no official documents related to what you would like to accomplish. Hopefully an experienced User will be able to assist.