presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/metadata/ShardCleaner.java/ShardCleaner/scheduleBackupCleanup
class ShardCleaner:    private void scheduleBackupCleanup()
    {
        scheduler.scheduleWithFixedDelay(this::runBackupCleanup, 0, backupCleanerInterval.toMillis(), MILLISECONDS);
    }