VSPEX BLUE and VDPA

Hi there,

I understand that VDPA is included at no additional cost with both VSPEX BLUE models standard and advanced but that Data Domain is however is supported and optional.  However considering Data Domain is not supplied by default, I would like to confirm the following backup topologies for VSPEX BLUE VDPA.

• If I have two VSPEX BLUE appliances connected to same network can I use VDPA on the 1st appliance to protect/backup VM's from 1st appliance and then replicate these backed up VM's to the 2nd VDPA on the second appliance?
• Is it possible to mount an external NFS datastore from a local storage system e.g. NetApp to the vSphere cluster in the VSPEX BLUE appliance and then place the VDPA appliance on that datastore?
• Beside Cloud Array for external offsite connectivity are there any options to connect external onsite storage to the VSPEX BLUE appliance to vSphere for additional datastores by use of any protocol?

Considering that Data Domain may not be used initially, I am trying to look at the available options when using VDPA on the VSPEX BLUE appliance to not have backup to itself but to backup and or replicate outside of the appliance. 

Look forward to opinions, thanks