Index.php

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<?php
namespace Magento\Backup\Controller\Adminhtml;

use Magento\Backup\Helper\Data as Helper;
use Magento\Framework\App\ObjectManager;

abstract class Index extends \Magento\Backend\App\Action
{
    const ADMIN_RESOURCE = 'Magento_Backend::backup';

    protected $_coreRegistry = null;

    protected $_backupFactory;

    protected $_fileFactory;

    protected $_backupModelFactory;

    protected $maintenanceMode;

    private $helper;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Framework\Backup\Factory $backupFactory,
        \Magento\Framework\App\Response\Http\FileFactory $fileFactory,
        \Magento\Backup\Model\BackupFactory $backupModelFactory,
        \Magento\Framework\App\MaintenanceMode $maintenanceMode,
        ?Helper $helper = null
    ) {
        $this->_coreRegistry = $coreRegistry;
        $this->_backupFactory = $backupFactory;
        $this->_fileFactory = $fileFactory;
        $this->_backupModelFactory = $backupModelFactory;
        $this->maintenanceMode = $maintenanceMode;
        $this->helper = $helper ?? ObjectManager::getInstance()->get(Helper::class);
        parent::__construct($context);
    }

    public function dispatch(\Magento\Framework\App\RequestInterface $request)
    {
        if (!$this->helper->isEnabled()) {
            return $this->_redirect('*/*/disabled');
        }

        return parent::dispatch($request);
    }
}