Hi,
this is an English speaking forum, so for others to help please keep the conversation to English, thx
Regarding your question on how to restore a VM/CT backup performed with a Proxmox Backup Server as target on a freshly installed Proxmox VE host: You will have to add the Proxmox Backup Server as storage to this new host (using the same namespace configuration as for the backup storage, and providing credentials which have permissions on that datastore) and restore it by selecting the snapshot in the storage content view.