Media.php

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<?php
namespace Magento\Framework\Backup;

class Media extends Snapshot
{
    public function rollback()
    {
        $this->_prepareIgnoreList();
        return parent::rollback();
    }

    public function create()
    {
        $this->_prepareIgnoreList();
        return parent::create();
    }

    public function getType()
    {
        return 'media';
    }

    protected function _prepareIgnoreList()
    {
        $rootDir = $this->getRootDir();
        $map = [
            $rootDir => ['var', 'pub'],
            $rootDir . '/pub' => ['media'],
            $rootDir . '/var' => [$this->getDbBackupFilename()],
        ];

        foreach ($map as $path => $whiteList) {
            foreach (new \DirectoryIterator($path) as $item) {
                $filename = $item->getFilename();
                if (!$item->isDot() && !in_array($filename, $whiteList)) {
                    $this->addIgnorePaths(str_replace('\\', '/', $item->getPathname()));
                }
            }
        }

        return $this;
    }
}