diff --git a/weed/command/scaffold.go b/weed/command/scaffold.go
index 3ac7c021d..58143a0ad 100644
--- a/weed/command/scaffold.go
+++ b/weed/command/scaffold.go
@@ -356,7 +356,8 @@ enabled = false
 directory = "/data"
 
 [sink.local_incremental]
-# all replicated files are under creation time as yyyy-mm-dd directories
+# all replicated files are under modified time as yyyy-mm-dd directories
+# so each date directory contains all new and updated files.
 enabled = false
 directory = "/backup"
 
diff --git a/weed/replication/replicator.go b/weed/replication/replicator.go
index 90e1f7cdd..7688029e6 100644
--- a/weed/replication/replicator.go
+++ b/weed/replication/replicator.go
@@ -43,13 +43,13 @@ func (r *Replicator) Replicate(ctx context.Context, key string, message *filer_p
 	}
 	var dateKey string
 	if r.sink.GetName() == "local_incremental" {
-		var cTime int64
+		var mTime int64
 		if message.NewEntry != nil {
-			cTime = message.NewEntry.Attributes.Crtime
+			mTime = message.NewEntry.Attributes.Mtime
 		} else if message.OldEntry != nil {
-			cTime = message.OldEntry.Attributes.Crtime
+			mTime = message.OldEntry.Attributes.Mtime
 		}
-		dateKey = time.Unix(cTime, 0).Format("2006-01-02")
+		dateKey = time.Unix(mTime, 0).Format("2006-01-02")
 	}
 	newKey := util.Join(r.sink.GetSinkToDirectory(), dateKey, key[len(r.source.Dir):])
 	glog.V(3).Infof("replicate %s => %s", key, newKey)