My HA ran on my miniPC under Proxmox. Unfortunately I broke Proxmox and had to reinstall it together with the HA node.
Is there a way to figure out, what MAC address did my former HA config used from the Backup file?
If you can point Proxmox to your backup directory, then select one of the HA backups, click on “show configuration” you will see a section starting with net0: virtio= …. here will be the MAC address.