batch := make([]ObjectInfo, 0, *r.Source.Snowball.Batch)
				writeFn := func(batch []ObjectInfo) {
					if len(batch) > 0 {
						if err := r.writeAsArchive(ctx, api, cl, batch, r.Target.Prefix); err != nil {
							batchLogOnceIf(ctx, err, job.ID+"writeAsArchive")
							for _, b := range batch {
								slowCh <- itemOrErr[ObjectInfo]{Item: b}
							}
						} else {