presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/backup/BackupServiceManager.java/BackupServiceManager/BackupServiceManager
class BackupServiceManager:    @Inject
    public BackupServiceManager(Optional<BackupStore> backupStore)
    {
        this.backupStore = requireNonNull(backupStore, "backupStore is null");
    }