Hi Elias,
It looks like the error is happening because the VM used for backup has multiple network cards, which can interfere with the transmission network.
To fix this, follow these steps:
Go to Backup > Backup Strategies > Transmission Strategy > Transmission Network.
Change the transmission network when creating a new VM backup job.
Once the network is updated, try running the backup again.
That should solve the issue! Let me know if you need any further help. π