Learn more about Proxmox Backup Server.
Create a user and an API token similar to the Proxmox VE description. The "Audit" role is required for both the user and token (not group).
Allowed fields: ["datastore_usage", "failed_tasks_24h", "cpu_usage", "memory_usage"].
widget:
type: proxmoxbackupserver
url: https://proxmoxbackupserver.host:port
username: api_token_id
password: api_token_secret
datastore: datastore_name #optional; if omitted, will display a combination of all datastores used / total