Proxmox Backup server features

Hello,
I have read about Proxmox Backup server but it is not clear to me some matters.
Lets suppose the following scenario :
- we have a Proxmox server backup should installed on a bare metal with at least 10GB RAM
and 32GB HD .
- we have a proxmox cluster 8.3 containing 4 nodes configured with 2TB of zfs storage on each one,
On each node there are running at least 5 VMs
- we have 2 NAS of 8TB to use as storage for backups

Can I full backup all VMs on all nodes on NAS ?
Can...

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