Mastering Proxmox - Third Edition

Centralized backup

Shared storage makes centralized backup possible by allowing each virtual machine host node to create a backup in one central location. This helps a backup manager or an administrator to implement a solid backup plan and manage the existing backups. Since a Proxmox node failure will not take the shared storage system down, virtual machines can be easily restored to a new node to reduce downtime.

Always use a separate node for backup purposes. It is not a wise practice to store both virtual machines and their backups on the same node.