Pimcore\Backup::fileStep PHP Method

    public function fileStep($step)
    {
        $filesContainer = $this->getFilesToBackup();
        $files = $filesContainer[$step];
        $excludePatterns = [PIMCORE_FRONTEND_MODULE . "/var/backup/.*", PIMCORE_FRONTEND_MODULE . "/var/cache/.*", PIMCORE_FRONTEND_MODULE . "/var/log/.*", PIMCORE_FRONTEND_MODULE . "/var/system/.*", PIMCORE_FRONTEND_MODULE . "/var/tmp/.*", PIMCORE_FRONTEND_MODULE . "/var/webdav/.*"];
        if (!empty($this->additionalExcludePatterns) && is_array($this->additionalExcludePatterns)) {
            $excludePatterns = array_merge($excludePatterns, $this->additionalExcludePatterns);
        }
        foreach ($excludePatterns as &$excludePattern) {
            $excludePattern = "@" . $excludePattern . "@";
        }
        clearstatcache();
        foreach ($files as $file) {
            if ($file) {
                if (file_exists($file) && is_readable($file)) {
                    $exclude = false;
                    $relPath = str_replace(PIMCORE_DOCUMENT_ROOT, "", $file);
                    $relPath = str_replace(DIRECTORY_SEPARATOR, "/", $relPath);
                    // windows compatibility
                    foreach ($excludePatterns as $pattern) {
                        if (preg_match($pattern, $relPath)) {
                            $exclude = true;
                        }
                    }
                    if (!$exclude && is_file($file)) {
                        $this->getArchive()->addFile($file, ltrim($relPath, "/"));
                    } else {
                        Logger::info("Backup: Excluded: " . $file);
                    }
                } else {
                    Logger::err("Backup: Can't read file: " . $file);
                }
            }
        }
        $this->setFileAmount($this->getFileAmount() + count($files));
        return ["success" => true, "filesize" => $this->getFormattedFilesize(), "fileAmount" => $this->getFileAmount()];
    }