presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/backup/BackupManager.java/BackupManager/BackupManager
class BackupManager:    @Inject
    public BackupManager(Optional<BackupStore> backupStore, StorageService storageService, BackupConfig config)
    {
        this(backupStore, storageService, config.getBackupThreads());
    }