Acquia\Cloud\Api\CloudApiClient::createDatabaseBackup PHP Method

    public function createDatabaseBackup($site, $env, $db)
    {
        $variables = array('site' => $site, 'env' => $env, 'db' => $db);
        $request = $this->post(array('{+base_path}/sites/{site}/envs/{env}/dbs/{db}/backups.json', $variables));
        return new Response\Task($request);
    }