code: final String backupTimeAsString(final String logFilename, final File baseFile) {
      final Pattern pattern = this.backupCountPattern(baseFile);
      final Matcher matcher = pattern.matcher(logFilename);
      if (matcher.find()) {
        return matcher.group(2); // date formatted part is group 2
      }
      return "";
    }
docs: TODO Delete and change this method's regex test for backupTimeAndCount