/**
 * Backup application payload definition.
 */
type Backup = {
    /**
     * Application ID to backup.
     * If not specified, nothing will be checked.
     *
     * @example 730
     */
    id?: string | number;
};
/**
 * Opens up the Backup Wizard and checks the specified application.
 *
 * @param payload Backup payload.
 * @returns Steam backup URL.
 * @example
 * backup({ id: 730 })
 * // => 'steam://backup/730'
 * @example
 * backup({})
 * // => 'steam://backup'
 * @link https://developer.valvesoftware.com/wiki/Steam_browser_protocol
 */
export declare function backup(payload?: Backup): string;
export {};