how to backup my proxmox backup server

hello community,

First of all, I apologize for my English.

I would like to ask for your help in the following.

I have a cluster with 10 nodes and I am backing them up with proxmox backup server.

I recently purchased veeam backup and would like to backup my proxmox backup server.

What directories should I back up to be able to recover my proxmox backup server along with all its content in the event of a disaster?

thanks for everything.