Hi,

This error is telling you that you don't have enough free space on the SR where the VDI currently reside.

Regards,
Dan

@john-c the problem is really the user/password.
I created a new user and all works fine!

@felipefonsecabh You need to check the specific checkbox:
https://xen-orchestra.com/docs/full_backups.html#backup-without-snapshot

Para conectar as outras VMs ao pfSense você pode usar uma rede do tipo internal. depois de conectar as VMs acredito que seja mais uma questão de configuração de pfSense mesmo.

Quanto a questão do offload. Você consegue desativar as opções de offload por hardware através do pfSense mesmo (nesse caso não precisa rodar os comandos de alteração das VIFs) :

Network Interfaces

Hardware Checksum Offloading
Disable hardware checksum offload

Hardware TCP Segmentation Offloading
Disable hardware TCP segmentation offload

Hardware Large Receive Offloading
Disable hardware large receive offload

System > Advanced > Miscellaneous
Cryptographic & Thermal Hardware

Cryptographic Hardware
AES-NI CPU-based Acceleration

Well, it's a bit hard to tell you directly what to do vs XOA, because on XOA you are already on a validated OS (Debian) with some packages installed.

On which OS did you install Xen Orchestra in the first place?