I solved the VEB Computername rename problem now. VEB is saving the Computername inside the SQL LocalDB while first installation. You just have to delete all LocalDB Copies which are created by first Installation. Unfortunately the uninstall is NOT deleting the LocalDB Copies, so the old Computername survives by VEB reinstallation.
Here are the steps to do:
1.: VEB has NOT to be installed new, so EndPoint cloning with installed VEB is possible.
2.: Stop VEB Systray Tool and Service VeeamEndpointBackupSvc
3.: Delete following directories:
4.: Delete following LocalDB copies:
5.: Start Service VeeamEndpointBackupSvc and VEB Systray Tool
The Service Start takes a couple of time, because a new LocalDB is created now.
6.: Reconfigure the Backup Job
Enjoy this great peace of Software.