private void tryPersistMonthlyUsage() {
    if (backupFileManager != null) {
      try {
        backupFileManager.persistentBackupFile(currentMonth, containerStorageUsageMonthlyBase);
        logger.info("Persisted monthly container usage for {}", currentMonth);
      } catch (IOException e) {
        // Error already been logged from backup file manager.
      }
    }
  }
Try to persist the monthly base usage in the backup file and ignore any exceptions.
ambry-quota/src/main/java/com/github/ambry/quota/storage/MySqlStorageUsageRefresher.java