How to Hide BackWPup Admin Menus

function plt_hide_backwpup_menus() {
	//Hide "BackWPup".
	remove_menu_page('backwpup');
	//Hide "BackWPup → Settings".
	remove_submenu_page('backwpup', 'backwpup');
	//Hide "BackWPup → Docs".
	remove_submenu_page('backwpup', 'docs');
	//Hide "BackWPup → Upgrade to Pro".
	remove_submenu_page('backwpup', 'buypro');
	//Hide "BackWPup → Onboarding".
	remove_submenu_page('backwpup', 'backwpuponboarding');
}

add_action('admin_menu', 'plt_hide_backwpup_menus', 11);

Where do I put this code?