Storage for Proxmox with VSA 13.1

Hello,

I need some advices for a new setup with VSA and Proxmox.

The setup :

1 cluster with 2 Proxmox node with 1 volume for the OS and 1 volume for the storage of the VM

The storage is done with Datacore Sansymphony (HCI solution). 

1 VSA + 2 worker + 1 VIA repository for backup + 1 Synology NAS NFS for backup copy 

I read Veeam documentation and limitation and I have 2 mainly questions :

1. The Snapshot storage must be file level storage. In my scenario, that mean I need to use the volume available on the same disk as the OS right ? Because the storage used for the VM will be block storage … 

2. For the worker, same issue if I understand it correctly, it must be file-level storage that supports snapshots. That mean I also need to use the same volume right ?

How do you usually manage it ? 

Finally, for the File system of it, do you use ZFS or XFS or EXT4 ? 

Thanks for your answer