Tar.php

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<?php
namespace Magento\Framework\Backup\Archive;

use Magento\Framework\Backup\Filesystem\Iterator\Filter;
use RecursiveDirectoryIterator;
use RecursiveIteratorIterator;

class Tar extends \Magento\Framework\Archive\Tar
{
    protected $_skipFiles = [];

    protected function _createTar($skipRoot = false, $finalize = false)
    {
        $path = $this->_getCurrentFile();

        $filesystemIterator = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($path),
            RecursiveIteratorIterator::SELF_FIRST
        );

        $iterator = new Filter(
            $filesystemIterator,
            $this->_skipFiles
        );

        foreach ($iterator as $item) {
            $this->_setCurrentFile($item->getPathname());
            $this->_packAndWriteCurrentFile();
        }

        if ($finalize) {
            $this->_getWriter()->write(str_repeat("\0", self::TAR_BLOCK_SIZE * 12));
        }
    }

    public function setSkipFiles(array $skipFiles)
    {
        $this->_skipFiles = $skipFiles;
        return $this;
    }
}