private void initDBManager() throws DataBaseServerException {
        dbManager = new DataBaseManager();
        System.out.println("Start loading data from backup...");
        try {
            dbManager.loadDataFromBackup();
        } catch (IOException e) {
            throw new DataBaseServerException("Unable to load data from backup", e);
        }
        System.out.println("Data from backup loaded successfully");
    }