Using own WebDav-Server (runs well) I notified 2 problems:
a. I couldn't found any status info about the assigned WebDav-Server to a space. Bad if I use more than one WebDav-Server.
b. Security problem: In the property dialog of WebDav-Server it is possible to see the server password in clear text. That means every one who has read access to my computer or to any backup has this password! It should be stored encrypted and not possible to view.