Return users and domains with backup metadata

Example response

{
  "data": {
    "username": "example.com",
    "username2": "example.net",
    "username3": "example.org"
  },
  "metadata": {
    "command": "get_users_and_domains_with_backup_metadata",
    "reason": "OK",
    "result": 1,
    "version": 1
  }
}