var (
			walkCh = make(chan itemOrErr[ObjectInfo], 100)
			slowCh = make(chan itemOrErr[ObjectInfo], 100)
		)

		if r.Source.Snowball.Disable != nil && !*r.Source.Snowball.Disable && r.Source.Type.isMinio() && r.Target.Type.isMinio() {
			go func() {
				// Snowball currently needs the high level minio-go Client, not the Core one
				cl, err := minio.New(u.Host, &minio.Options{