C:/xampp/htdocs/moodle/backup/util/helper/backup_file_manager.class.php

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<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

class backup_file_manager {

    public static function get_backup_storage_base_dir($backupid) {
        global $CFG;

        return $CFG->tempdir . '/backup/' . $backupid . '/files';
    }

    public static function get_backup_content_file_location($contenthash) {
        $l1 = $contenthash[0].$contenthash[1];
        return "$l1/$contenthash";
    }

    public static function copy_file_moodle2backup($backupid, $filerecorid) {
        global $DB;

        // Normalise param
        if (!is_object($filerecorid)) {
            $filerecorid = $DB->get_record('files', array('id' => $filerecorid));
        }

        // Directory, nothing to do
        if ($filerecorid->filename === '.') {
            return;
        }

        $fs = get_file_storage();
        $file = $fs->get_file_instance($filerecorid);

        // Calculate source and target paths (use same subdirs strategy for both)
        $targetfilepath = self::get_backup_storage_base_dir($backupid) . '/' .
                          self::get_backup_content_file_location($filerecorid->contenthash);

        // Create target dir if necessary
        if (!file_exists(dirname($targetfilepath))) {
            if (!check_dir_exists(dirname($targetfilepath), true, true)) {
                throw new backup_helper_exception('cannot_create_directory', dirname($targetfilepath));
            }
        }

        // And copy the file (if doesn't exist already)
        if (!file_exists($targetfilepath)) {
            $file->copy_content_to($targetfilepath);
        }
    }
}