Can you be more specific?

I first ran Proxmox on it (which ran fine, just overkill for my use-case).

Now it’s Windows server and anything I do on it is done in a VM via VMware Workstation (since it’s free). So the host os doesn’t see much change and any changes that break things can be rolled back via a VM snapshot. Proxmox ZFS would be better for this, but I don’t need it, yet.