function plt_hide_cyan_backup_menus() {
//Hide "CYAN Backup".
remove_menu_page('cyan-backup');
//Hide "CYAN Backup → Backups".
remove_submenu_page('cyan-backup', 'cyan-backup');
//Hide "CYAN Backup → Options".
remove_submenu_page('cyan-backup', 'cyan-backup-options');
//Hide "CYAN Backup → About".
remove_submenu_page('cyan-backup', 'cyan-backup-about');
}
add_action('admin_menu', 'plt_hide_cyan_backup_menus', 11);