def METHOD_NAME(backup_policy_name: Optional[str] = None,
                      resource_group_name: Optional[str] = None,
                      vault_name: Optional[str] = None,
                      opts: Optional[pulumi.InvokeOptions] = None) -> AwaitableGetBackupPolicyResult:
    """
    Gets a backup policy belonging to a backup vault
    Azure REST API version: 2023-01-01.
    :param str resource_group_name: The name of the resource group. The name is case insensitive.
    :param str vault_name: The name of the backup vault.
    """
    __args__ = dict()
    __args__['backupPolicyName'] = backup_policy_name
    __args__['resourceGroupName'] = resource_group_name
    __args__['vaultName'] = vault_name
    opts = pulumi.InvokeOptions.merge(_utilities.get_invoke_opts_defaults(), opts)
    __ret__ = pulumi.runtime.invoke('azure-native:dataprotection:getBackupPolicy', __args__, opts=opts, typ=GetBackupPolicyResult).value
    return AwaitableGetBackupPolicyResult(
        id=pulumi.get(__ret__, 'id'),
        name=pulumi.get(__ret__, 'name'),
        properties=pulumi.get(__ret__, 'properties'),
        system_data=pulumi.get(__ret__, 'system_data'),
        type=pulumi.get(__ret__, 'type'))