I suppose you could deploy an HA cluster using either Ceph or StarWind VSAN HA storage technology. These solutions replicate data across cluster nodes, ensuring your VMs are highly available. They both fit Proxmox.
Consider using a NAS solution: https://www.pcmag.com/picks/the-best-nas-network-attached-storage-devices.
I suppose you could deploy an HA cluster using either Ceph or StarWind VSAN HA storage technology. These solutions replicate data across cluster nodes, ensuring your VMs are highly available. They both fit Proxmox.