HM\BackUpWordPress\Site_Size::get_site_size PHP Method

    public function get_site_size()
    {
        if ($this->size) {
            return $this->size;
        }
        $size = 0;
        // Include database size except for file only schedule.
        if ('file' !== $this->type) {
            $size = (int) get_transient('hmbkp_database_size');
            if (!$size) {
                global $wpdb;
                $tables = $wpdb->get_results('SHOW TABLE STATUS FROM `' . DB_NAME . '`', ARRAY_A);
                foreach ($tables as $table) {
                    $size += (double) $table['Data_length'];
                }
                set_transient('hmbkp_database_size', $size, WEEK_IN_SECONDS);
            }
        }
        // Include total size of dirs/files except for database only schedule.
        if ('database' !== $this->type) {
            $root = new \SplFileInfo(Path::get_root());
            $size += $this->filesize($root);
        }
        $this->size = $size;
        return $size;
    }