Delete Backups without occ or file access (at Hetzner Storage Share)?

[RichardHausgartner]

I'm using Hetzners Storage Share and installed "Nextcloud Backup 1.3.0".
I made an initial full backup, but I don't need "Nextcloud Backup" anymore.

At Hetzners Storage Share, there is access to occ limited, and I can't execute the documented occ commands for deleting backups. It is also not possible to access the "appdata" folder via FTP.

How to delete the full and partial backups made with "Nextcloud backup" without access occ or file access to my nextcloud installation?

Thanks!