Utilize the versatility of Proxmox by creating a cluster of nodes and setting up high availability. Screenshots will help you understand easily.

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Proxmox uses quorum to determine which node the VMs will be automatically transferred to if a node goes down unexpectedly. If you have at least 3 physical servers in a cluster, you can set up high availability between the three servers. You will also need a NAS or some type of shared storage for this to work correctly.

Clustering and High Availability [Proxmox Series #7]