ExportTotalsExcel.php

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<?php
namespace Magento\Reports\Controller\Adminhtml\Report\Customer;

use Magento\Backend\Block\Widget\Grid\ExportInterface;
use Magento\Framework\App\ResponseInterface;
use Magento\Framework\App\Filesystem\DirectoryList;

class ExportTotalsExcel extends \Magento\Reports\Controller\Adminhtml\Report\Customer
{
    public function execute()
    {
        $this->_view->loadLayout();
        $fileName = 'customer_totals.xml';
        $exportBlock = $this->_view->getLayout()->getChildBlock('adminhtml.report.grid', 'grid.export');
        return $this->_fileFactory->create(
            $fileName,
            $exportBlock->getExcelFile($fileName),
            DirectoryList::VAR_DIR
        );
    }
}