Solved it via complete reinstall of the server, don´t forget to install “apt-get install libguestfs-tools”.
On the WEB GUI I changed the path to media/BACKUP/SRV-HYPERV-01, made a full image backup try to mount image in WEB Gui - still same Error:
2025-11-08 16:46:14: ERROR: Image mounting failed: Error creating mountpoint at “/media/BACKUP//SRV-DB-01/251108-1531_Image_D/contents0”. Err: 2
Path missing.
Soloution: via CLI on the Server:
sudo systemctl stop urbackupsrv
sudo nano /etc/urbackup/urbackupfolder
correct file to new path, in my case “media/BACKUP/SRV-HYPERV.01”
sudo systemctl start urbackupsrv
This Post helped me: Error creating mountpoint [urbackup_mount_helper] - UrBackup - Discourse
Info for me: when you are stressed out because of a disaster try mounting via the CLI first and copy the files to the nas what you need:
sudo urbackupsrv mount-vhd -f /media/BACKUP/SRV-HYPERV-01/SRV-DB-01/251108-1531_Image_D/Image_D_251108-1531.vhdz -m /mnt/restore/