core/homeassistant/components/backup/icons.json

{
  "entity": {
    "event": {
      "automatic_backup_event": {
        "default": "mdi:database"
      }
    }
  },
  "services": {
    "create": {
      "service": "mdi:cloud-upload"
    },
    "create_automatic": {
      "service": "mdi:cloud-upload"
    }
  }
}