diff --git a/weed/command/backup.go b/weed/command/backup.go
index 3370a478a..7a98f60d9 100644
--- a/weed/command/backup.go
+++ b/weed/command/backup.go
@@ -113,7 +113,7 @@ func runBackup(cmd *Command, args []string) bool {
 	}
 	defer v.Close()
 
-	if err := v.Follow(volumeServer, grpcDialOption); err != nil {
+	if err := v.IncrementalBackup(volumeServer, grpcDialOption); err != nil {
 		fmt.Printf("Error synchronizing volume %d: %v\n", vid, err)
 		return true
 	}
diff --git a/weed/pb/volume_server.proto b/weed/pb/volume_server.proto
index b87654dd4..7ff1ce25b 100644
--- a/weed/pb/volume_server.proto
+++ b/weed/pb/volume_server.proto
@@ -24,7 +24,7 @@ service VolumeServer {
 
     rpc VolumeSyncStatus (VolumeSyncStatusRequest) returns (VolumeSyncStatusResponse) {
     }
-    rpc VolumeFollow (VolumeFollowRequest) returns (stream VolumeFollowResponse) {
+    rpc VolumeIncrementalCopy (VolumeIncrementalCopyRequest) returns (stream VolumeIncrementalCopyResponse) {
     }
 
     rpc VolumeMount (VolumeMountRequest) returns (VolumeMountResponse) {
@@ -34,7 +34,8 @@ service VolumeServer {
     rpc VolumeDelete (VolumeDeleteRequest) returns (VolumeDeleteResponse) {
     }
 
-    rpc ReplicateVolume (ReplicateVolumeRequest) returns (ReplicateVolumeResponse) {
+    // copy the .idx .dat files, and mount this volume
+    rpc VolumeCopy (VolumeCopyRequest) returns (VolumeCopyResponse) {
     }
     rpc ReadVolumeFileStatus (ReadVolumeFileStatusRequest) returns (ReadVolumeFileStatusResponse) {
     }
@@ -117,11 +118,11 @@ message VolumeSyncStatusResponse {
     uint64 idx_file_size = 8;
 }
 
-message VolumeFollowRequest {
+message VolumeIncrementalCopyRequest {
     uint32 volume_id = 1;
     uint64 since = 2;
 }
-message VolumeFollowResponse {
+message VolumeIncrementalCopyResponse {
     bytes file_content = 1;
 }
 
@@ -143,14 +144,14 @@ message VolumeDeleteRequest {
 message VolumeDeleteResponse {
 }
 
-message ReplicateVolumeRequest {
+message VolumeCopyRequest {
     uint32 volume_id = 1;
     string collection = 2;
     string replication = 3;
     string ttl = 4;
     string source_data_node = 5;
 }
-message ReplicateVolumeResponse {
+message VolumeCopyResponse {
 }
 
 message CopyFileRequest {
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index 88252a1a7..cb6ca7c82 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -27,16 +27,16 @@ It has these top-level messages:
 	AllocateVolumeResponse
 	VolumeSyncStatusRequest
 	VolumeSyncStatusResponse
-	VolumeFollowRequest
-	VolumeFollowResponse
+	VolumeIncrementalCopyRequest
+	VolumeIncrementalCopyResponse
 	VolumeMountRequest
 	VolumeMountResponse
 	VolumeUnmountRequest
 	VolumeUnmountResponse
 	VolumeDeleteRequest
 	VolumeDeleteResponse
-	ReplicateVolumeRequest
-	ReplicateVolumeResponse
+	VolumeCopyRequest
+	VolumeCopyResponse
 	CopyFileRequest
 	CopyFileResponse
 	ReadVolumeFileStatusRequest
@@ -418,40 +418,40 @@ func (m *VolumeSyncStatusResponse) GetIdxFileSize() uint64 {
 	return 0
 }
 
-type VolumeFollowRequest struct {
+type VolumeIncrementalCopyRequest struct {
 	VolumeId uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
 	Since    uint64 `protobuf:"varint,2,opt,name=since" json:"since,omitempty"`
 }
 
-func (m *VolumeFollowRequest) Reset()                    { *m = VolumeFollowRequest{} }
-func (m *VolumeFollowRequest) String() string            { return proto.CompactTextString(m) }
-func (*VolumeFollowRequest) ProtoMessage()               {}
-func (*VolumeFollowRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
+func (m *VolumeIncrementalCopyRequest) Reset()                    { *m = VolumeIncrementalCopyRequest{} }
+func (m *VolumeIncrementalCopyRequest) String() string            { return proto.CompactTextString(m) }
+func (*VolumeIncrementalCopyRequest) ProtoMessage()               {}
+func (*VolumeIncrementalCopyRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
 
-func (m *VolumeFollowRequest) GetVolumeId() uint32 {
+func (m *VolumeIncrementalCopyRequest) GetVolumeId() uint32 {
 	if m != nil {
 		return m.VolumeId
 	}
 	return 0
 }
 
-func (m *VolumeFollowRequest) GetSince() uint64 {
+func (m *VolumeIncrementalCopyRequest) GetSince() uint64 {
 	if m != nil {
 		return m.Since
 	}
 	return 0
 }
 
-type VolumeFollowResponse struct {
+type VolumeIncrementalCopyResponse struct {
 	FileContent []byte `protobuf:"bytes,1,opt,name=file_content,json=fileContent,proto3" json:"file_content,omitempty"`
 }
 
-func (m *VolumeFollowResponse) Reset()                    { *m = VolumeFollowResponse{} }
-func (m *VolumeFollowResponse) String() string            { return proto.CompactTextString(m) }
-func (*VolumeFollowResponse) ProtoMessage()               {}
-func (*VolumeFollowResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{19} }
+func (m *VolumeIncrementalCopyResponse) Reset()                    { *m = VolumeIncrementalCopyResponse{} }
+func (m *VolumeIncrementalCopyResponse) String() string            { return proto.CompactTextString(m) }
+func (*VolumeIncrementalCopyResponse) ProtoMessage()               {}
+func (*VolumeIncrementalCopyResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{19} }
 
-func (m *VolumeFollowResponse) GetFileContent() []byte {
+func (m *VolumeIncrementalCopyResponse) GetFileContent() []byte {
 	if m != nil {
 		return m.FileContent
 	}
@@ -530,7 +530,7 @@ func (m *VolumeDeleteResponse) String() string            { return proto.Compact
 func (*VolumeDeleteResponse) ProtoMessage()               {}
 func (*VolumeDeleteResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{25} }
 
-type ReplicateVolumeRequest struct {
+type VolumeCopyRequest struct {
 	VolumeId       uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
 	Collection     string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
 	Replication    string `protobuf:"bytes,3,opt,name=replication" json:"replication,omitempty"`
@@ -538,53 +538,53 @@ type ReplicateVolumeRequest struct {
 	SourceDataNode string `protobuf:"bytes,5,opt,name=source_data_node,json=sourceDataNode" json:"source_data_node,omitempty"`
 }
 
-func (m *ReplicateVolumeRequest) Reset()                    { *m = ReplicateVolumeRequest{} }
-func (m *ReplicateVolumeRequest) String() string            { return proto.CompactTextString(m) }
-func (*ReplicateVolumeRequest) ProtoMessage()               {}
-func (*ReplicateVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{26} }
+func (m *VolumeCopyRequest) Reset()                    { *m = VolumeCopyRequest{} }
+func (m *VolumeCopyRequest) String() string            { return proto.CompactTextString(m) }
+func (*VolumeCopyRequest) ProtoMessage()               {}
+func (*VolumeCopyRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{26} }
 
-func (m *ReplicateVolumeRequest) GetVolumeId() uint32 {
+func (m *VolumeCopyRequest) GetVolumeId() uint32 {
 	if m != nil {
 		return m.VolumeId
 	}
 	return 0
 }
 
-func (m *ReplicateVolumeRequest) GetCollection() string {
+func (m *VolumeCopyRequest) GetCollection() string {
 	if m != nil {
 		return m.Collection
 	}
 	return ""
 }
 
-func (m *ReplicateVolumeRequest) GetReplication() string {
+func (m *VolumeCopyRequest) GetReplication() string {
 	if m != nil {
 		return m.Replication
 	}
 	return ""
 }
 
-func (m *ReplicateVolumeRequest) GetTtl() string {
+func (m *VolumeCopyRequest) GetTtl() string {
 	if m != nil {
 		return m.Ttl
 	}
 	return ""
 }
 
-func (m *ReplicateVolumeRequest) GetSourceDataNode() string {
+func (m *VolumeCopyRequest) GetSourceDataNode() string {
 	if m != nil {
 		return m.SourceDataNode
 	}
 	return ""
 }
 
-type ReplicateVolumeResponse struct {
+type VolumeCopyResponse struct {
 }
 
-func (m *ReplicateVolumeResponse) Reset()                    { *m = ReplicateVolumeResponse{} }
-func (m *ReplicateVolumeResponse) String() string            { return proto.CompactTextString(m) }
-func (*ReplicateVolumeResponse) ProtoMessage()               {}
-func (*ReplicateVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{27} }
+func (m *VolumeCopyResponse) Reset()                    { *m = VolumeCopyResponse{} }
+func (m *VolumeCopyResponse) String() string            { return proto.CompactTextString(m) }
+func (*VolumeCopyResponse) ProtoMessage()               {}
+func (*VolumeCopyResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{27} }
 
 type CopyFileRequest struct {
 	VolumeId  uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
@@ -829,16 +829,16 @@ func init() {
 	proto.RegisterType((*AllocateVolumeResponse)(nil), "volume_server_pb.AllocateVolumeResponse")
 	proto.RegisterType((*VolumeSyncStatusRequest)(nil), "volume_server_pb.VolumeSyncStatusRequest")
 	proto.RegisterType((*VolumeSyncStatusResponse)(nil), "volume_server_pb.VolumeSyncStatusResponse")
-	proto.RegisterType((*VolumeFollowRequest)(nil), "volume_server_pb.VolumeFollowRequest")
-	proto.RegisterType((*VolumeFollowResponse)(nil), "volume_server_pb.VolumeFollowResponse")
+	proto.RegisterType((*VolumeIncrementalCopyRequest)(nil), "volume_server_pb.VolumeIncrementalCopyRequest")
+	proto.RegisterType((*VolumeIncrementalCopyResponse)(nil), "volume_server_pb.VolumeIncrementalCopyResponse")
 	proto.RegisterType((*VolumeMountRequest)(nil), "volume_server_pb.VolumeMountRequest")
 	proto.RegisterType((*VolumeMountResponse)(nil), "volume_server_pb.VolumeMountResponse")
 	proto.RegisterType((*VolumeUnmountRequest)(nil), "volume_server_pb.VolumeUnmountRequest")
 	proto.RegisterType((*VolumeUnmountResponse)(nil), "volume_server_pb.VolumeUnmountResponse")
 	proto.RegisterType((*VolumeDeleteRequest)(nil), "volume_server_pb.VolumeDeleteRequest")
 	proto.RegisterType((*VolumeDeleteResponse)(nil), "volume_server_pb.VolumeDeleteResponse")
-	proto.RegisterType((*ReplicateVolumeRequest)(nil), "volume_server_pb.ReplicateVolumeRequest")
-	proto.RegisterType((*ReplicateVolumeResponse)(nil), "volume_server_pb.ReplicateVolumeResponse")
+	proto.RegisterType((*VolumeCopyRequest)(nil), "volume_server_pb.VolumeCopyRequest")
+	proto.RegisterType((*VolumeCopyResponse)(nil), "volume_server_pb.VolumeCopyResponse")
 	proto.RegisterType((*CopyFileRequest)(nil), "volume_server_pb.CopyFileRequest")
 	proto.RegisterType((*CopyFileResponse)(nil), "volume_server_pb.CopyFileResponse")
 	proto.RegisterType((*ReadVolumeFileStatusRequest)(nil), "volume_server_pb.ReadVolumeFileStatusRequest")
@@ -867,11 +867,12 @@ type VolumeServerClient interface {
 	DeleteCollection(ctx context.Context, in *DeleteCollectionRequest, opts ...grpc.CallOption) (*DeleteCollectionResponse, error)
 	AllocateVolume(ctx context.Context, in *AllocateVolumeRequest, opts ...grpc.CallOption) (*AllocateVolumeResponse, error)
 	VolumeSyncStatus(ctx context.Context, in *VolumeSyncStatusRequest, opts ...grpc.CallOption) (*VolumeSyncStatusResponse, error)
-	VolumeFollow(ctx context.Context, in *VolumeFollowRequest, opts ...grpc.CallOption) (VolumeServer_VolumeFollowClient, error)
+	VolumeIncrementalCopy(ctx context.Context, in *VolumeIncrementalCopyRequest, opts ...grpc.CallOption) (VolumeServer_VolumeIncrementalCopyClient, error)
 	VolumeMount(ctx context.Context, in *VolumeMountRequest, opts ...grpc.CallOption) (*VolumeMountResponse, error)
 	VolumeUnmount(ctx context.Context, in *VolumeUnmountRequest, opts ...grpc.CallOption) (*VolumeUnmountResponse, error)
 	VolumeDelete(ctx context.Context, in *VolumeDeleteRequest, opts ...grpc.CallOption) (*VolumeDeleteResponse, error)
-	ReplicateVolume(ctx context.Context, in *ReplicateVolumeRequest, opts ...grpc.CallOption) (*ReplicateVolumeResponse, error)
+	// copy the .idx .dat files, and mount this volume
+	VolumeCopy(ctx context.Context, in *VolumeCopyRequest, opts ...grpc.CallOption) (*VolumeCopyResponse, error)
 	ReadVolumeFileStatus(ctx context.Context, in *ReadVolumeFileStatusRequest, opts ...grpc.CallOption) (*ReadVolumeFileStatusResponse, error)
 	CopyFile(ctx context.Context, in *CopyFileRequest, opts ...grpc.CallOption) (VolumeServer_CopyFileClient, error)
 }
@@ -956,12 +957,12 @@ func (c *volumeServerClient) VolumeSyncStatus(ctx context.Context, in *VolumeSyn
 	return out, nil
 }
 
-func (c *volumeServerClient) VolumeFollow(ctx context.Context, in *VolumeFollowRequest, opts ...grpc.CallOption) (VolumeServer_VolumeFollowClient, error) {
-	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[0], c.cc, "/volume_server_pb.VolumeServer/VolumeFollow", opts...)
+func (c *volumeServerClient) VolumeIncrementalCopy(ctx context.Context, in *VolumeIncrementalCopyRequest, opts ...grpc.CallOption) (VolumeServer_VolumeIncrementalCopyClient, error) {
+	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[0], c.cc, "/volume_server_pb.VolumeServer/VolumeIncrementalCopy", opts...)
 	if err != nil {
 		return nil, err
 	}
-	x := &volumeServerVolumeFollowClient{stream}
+	x := &volumeServerVolumeIncrementalCopyClient{stream}
 	if err := x.ClientStream.SendMsg(in); err != nil {
 		return nil, err
 	}
@@ -971,17 +972,17 @@ func (c *volumeServerClient) VolumeFollow(ctx context.Context, in *VolumeFollowR
 	return x, nil
 }
 
-type VolumeServer_VolumeFollowClient interface {
-	Recv() (*VolumeFollowResponse, error)
+type VolumeServer_VolumeIncrementalCopyClient interface {
+	Recv() (*VolumeIncrementalCopyResponse, error)
 	grpc.ClientStream
 }
 
-type volumeServerVolumeFollowClient struct {
+type volumeServerVolumeIncrementalCopyClient struct {
 	grpc.ClientStream
 }
 
-func (x *volumeServerVolumeFollowClient) Recv() (*VolumeFollowResponse, error) {
-	m := new(VolumeFollowResponse)
+func (x *volumeServerVolumeIncrementalCopyClient) Recv() (*VolumeIncrementalCopyResponse, error) {
+	m := new(VolumeIncrementalCopyResponse)
 	if err := x.ClientStream.RecvMsg(m); err != nil {
 		return nil, err
 	}
@@ -1015,9 +1016,9 @@ func (c *volumeServerClient) VolumeDelete(ctx context.Context, in *VolumeDeleteR
 	return out, nil
 }
 
-func (c *volumeServerClient) ReplicateVolume(ctx context.Context, in *ReplicateVolumeRequest, opts ...grpc.CallOption) (*ReplicateVolumeResponse, error) {
-	out := new(ReplicateVolumeResponse)
-	err := grpc.Invoke(ctx, "/volume_server_pb.VolumeServer/ReplicateVolume", in, out, c.cc, opts...)
+func (c *volumeServerClient) VolumeCopy(ctx context.Context, in *VolumeCopyRequest, opts ...grpc.CallOption) (*VolumeCopyResponse, error) {
+	out := new(VolumeCopyResponse)
+	err := grpc.Invoke(ctx, "/volume_server_pb.VolumeServer/VolumeCopy", in, out, c.cc, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -1077,11 +1078,12 @@ type VolumeServerServer interface {
 	DeleteCollection(context.Context, *DeleteCollectionRequest) (*DeleteCollectionResponse, error)
 	AllocateVolume(context.Context, *AllocateVolumeRequest) (*AllocateVolumeResponse, error)
 	VolumeSyncStatus(context.Context, *VolumeSyncStatusRequest) (*VolumeSyncStatusResponse, error)
-	VolumeFollow(*VolumeFollowRequest, VolumeServer_VolumeFollowServer) error
+	VolumeIncrementalCopy(*VolumeIncrementalCopyRequest, VolumeServer_VolumeIncrementalCopyServer) error
 	VolumeMount(context.Context, *VolumeMountRequest) (*VolumeMountResponse, error)
 	VolumeUnmount(context.Context, *VolumeUnmountRequest) (*VolumeUnmountResponse, error)
 	VolumeDelete(context.Context, *VolumeDeleteRequest) (*VolumeDeleteResponse, error)
-	ReplicateVolume(context.Context, *ReplicateVolumeRequest) (*ReplicateVolumeResponse, error)
+	// copy the .idx .dat files, and mount this volume
+	VolumeCopy(context.Context, *VolumeCopyRequest) (*VolumeCopyResponse, error)
 	ReadVolumeFileStatus(context.Context, *ReadVolumeFileStatusRequest) (*ReadVolumeFileStatusResponse, error)
 	CopyFile(*CopyFileRequest, VolumeServer_CopyFileServer) error
 }
@@ -1234,24 +1236,24 @@ func _VolumeServer_VolumeSyncStatus_Handler(srv interface{}, ctx context.Context
 	return interceptor(ctx, in, info, handler)
 }
 
-func _VolumeServer_VolumeFollow_Handler(srv interface{}, stream grpc.ServerStream) error {
-	m := new(VolumeFollowRequest)
+func _VolumeServer_VolumeIncrementalCopy_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(VolumeIncrementalCopyRequest)
 	if err := stream.RecvMsg(m); err != nil {
 		return err
 	}
-	return srv.(VolumeServerServer).VolumeFollow(m, &volumeServerVolumeFollowServer{stream})
+	return srv.(VolumeServerServer).VolumeIncrementalCopy(m, &volumeServerVolumeIncrementalCopyServer{stream})
 }
 
-type VolumeServer_VolumeFollowServer interface {
-	Send(*VolumeFollowResponse) error
+type VolumeServer_VolumeIncrementalCopyServer interface {
+	Send(*VolumeIncrementalCopyResponse) error
 	grpc.ServerStream
 }
 
-type volumeServerVolumeFollowServer struct {
+type volumeServerVolumeIncrementalCopyServer struct {
 	grpc.ServerStream
 }
 
-func (x *volumeServerVolumeFollowServer) Send(m *VolumeFollowResponse) error {
+func (x *volumeServerVolumeIncrementalCopyServer) Send(m *VolumeIncrementalCopyResponse) error {
 	return x.ServerStream.SendMsg(m)
 }
 
@@ -1309,20 +1311,20 @@ func _VolumeServer_VolumeDelete_Handler(srv interface{}, ctx context.Context, de
 	return interceptor(ctx, in, info, handler)
 }
 
-func _VolumeServer_ReplicateVolume_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(ReplicateVolumeRequest)
+func _VolumeServer_VolumeCopy_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(VolumeCopyRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(VolumeServerServer).ReplicateVolume(ctx, in)
+		return srv.(VolumeServerServer).VolumeCopy(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/volume_server_pb.VolumeServer/ReplicateVolume",
+		FullMethod: "/volume_server_pb.VolumeServer/VolumeCopy",
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(VolumeServerServer).ReplicateVolume(ctx, req.(*ReplicateVolumeRequest))
+		return srv.(VolumeServerServer).VolumeCopy(ctx, req.(*VolumeCopyRequest))
 	}
 	return interceptor(ctx, in, info, handler)
 }
@@ -1415,8 +1417,8 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 			Handler:    _VolumeServer_VolumeDelete_Handler,
 		},
 		{
-			MethodName: "ReplicateVolume",
-			Handler:    _VolumeServer_ReplicateVolume_Handler,
+			MethodName: "VolumeCopy",
+			Handler:    _VolumeServer_VolumeCopy_Handler,
 		},
 		{
 			MethodName: "ReadVolumeFileStatus",
@@ -1425,8 +1427,8 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 	},
 	Streams: []grpc.StreamDesc{
 		{
-			StreamName:    "VolumeFollow",
-			Handler:       _VolumeServer_VolumeFollow_Handler,
+			StreamName:    "VolumeIncrementalCopy",
+			Handler:       _VolumeServer_VolumeIncrementalCopy_Handler,
 			ServerStreams: true,
 		},
 		{
@@ -1441,79 +1443,80 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("volume_server.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 1183 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xac, 0x58, 0x5b, 0x73, 0xdb, 0xc4,
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+	0x35, 0x30, 0xb2, 0xba, 0x9c, 0x9a, 0x38, 0x18, 0x9e, 0x43, 0xbf, 0xa6, 0xcf, 0x71, 0x89, 0x51,
+	0xa0, 0xdd, 0x26, 0x98, 0x7a, 0x36, 0xa3, 0x3f, 0x6d, 0xad, 0x9f, 0xfa, 0xfe, 0x50, 0xe3, 0xbd,
+	0x9e, 0x23, 0x16, 0x75, 0xbd, 0x5e, 0xa5, 0x2a, 0x75, 0xbd, 0x5e, 0xc7, 0x4e, 0xe6, 0xd0, 0x31,
+	0x2c, 0x15, 0xa8, 0x06, 0x7a, 0xd0, 0x64, 0x59, 0x24, 0x30, 0xfa, 0xc3, 0x99, 0x7a, 0x99, 0x0f,
+	0x33, 0x9d, 0x5e, 0x6a, 0x5c, 0x35, 0x06, 0x57, 0x9c, 0x57, 0x0f, 0x66, 0xa9, 0x65, 0x0e, 0x7e,
+	0x00, 0xb8, 0x62, 0x06, 0xe8, 0x5e, 0x93, 0x5d, 0xfe, 0x2a, 0xee, 0x5f, 0xaf, 0x94, 0x41, 0xff,
+	0x0c, 0x2b, 0x75, 0x4f, 0x2f, 0xaa, 0xe9, 0xc2, 0x6b, 0xde, 0x77, 0x7d, 0xb7, 0xad, 0x7a, 0xe6,
+	0xf8, 0x35, 0x2c, 0xa6, 0x3c, 0x03, 0xdd, 0xad, 0x5a, 0x97, 0x38, 0x8f, 0x8e, 0xaf, 0x53, 0xb9,
+	0xaa, 0xa6, 0xe3, 0x79, 0xf1, 0xe7, 0xc3, 0xb3, 0x7f, 0x02, 0x00, 0x00, 0xff, 0xff, 0x47, 0x54,
+	0xf2, 0x7e, 0x93, 0x10, 0x00, 0x00,
 }
diff --git a/weed/server/volume_grpc_replicate.go b/weed/server/volume_grpc_copy.go
similarity index 95%
rename from weed/server/volume_grpc_replicate.go
rename to weed/server/volume_grpc_copy.go
index ae720144e..c32755f2f 100644
--- a/weed/server/volume_grpc_replicate.go
+++ b/weed/server/volume_grpc_copy.go
@@ -11,7 +11,8 @@ import (
 	"os"
 )
 
-func (vs *VolumeServer) ReplicateVolume(ctx context.Context, req *volume_server_pb.ReplicateVolumeRequest) (*volume_server_pb.ReplicateVolumeResponse, error) {
+// VolumeCopy copy the .idx .dat files, and mount the volume
+func (vs *VolumeServer) VolumeCopy(ctx context.Context, req *volume_server_pb.VolumeCopyRequest) (*volume_server_pb.VolumeCopyResponse, error) {
 
 	v := vs.store.GetVolume(storage.VolumeId(req.VolumeId))
 	if v != nil {
@@ -92,7 +93,7 @@ func (vs *VolumeServer) ReplicateVolume(ctx context.Context, req *volume_server_
 		return nil, fmt.Errorf("failed to mount volume %d: %v", req.VolumeId, err)
 	}
 
-	return &volume_server_pb.ReplicateVolumeResponse{}, err
+	return &volume_server_pb.VolumeCopyResponse{}, err
 }
 
 /**
diff --git a/weed/server/volume_grpc_follow.go b/weed/server/volume_grpc_copy_incremental.go
similarity index 82%
rename from weed/server/volume_grpc_follow.go
rename to weed/server/volume_grpc_copy_incremental.go
index c3ce774c0..41b7a798c 100644
--- a/weed/server/volume_grpc_follow.go
+++ b/weed/server/volume_grpc_copy_incremental.go
@@ -10,7 +10,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage"
 )
 
-func (vs *VolumeServer) VolumeFollow(req *volume_server_pb.VolumeFollowRequest, stream volume_server_pb.VolumeServer_VolumeFollowServer) error {
+func (vs *VolumeServer) VolumeIncrementalCopy(req *volume_server_pb.VolumeIncrementalCopyRequest, stream volume_server_pb.VolumeServer_VolumeIncrementalCopyServer) error {
 
 	v := vs.store.GetVolume(storage.VolumeId(req.VolumeId))
 	if v == nil {
@@ -47,12 +47,12 @@ func (vs *VolumeServer) VolumeSyncStatus(ctx context.Context, req *volume_server
 
 }
 
-func sendFileContent(datFile *os.File, buf []byte, startOffset, stopOffset int64, stream volume_server_pb.VolumeServer_VolumeFollowServer) error {
+func sendFileContent(datFile *os.File, buf []byte, startOffset, stopOffset int64, stream volume_server_pb.VolumeServer_VolumeIncrementalCopyServer) error {
 	var blockSizeLimit = int64(len(buf))
 	for i := int64(0); i < stopOffset-startOffset; i += blockSizeLimit {
 		n, readErr := datFile.ReadAt(buf, startOffset+i)
 		if readErr == nil || readErr == io.EOF {
-			resp := &volume_server_pb.VolumeFollowResponse{}
+			resp := &volume_server_pb.VolumeIncrementalCopyResponse{}
 			resp.FileContent = buf[:int64(n)]
 			sendErr := stream.Send(resp)
 			if sendErr != nil {
diff --git a/weed/shell/command_volume_fix_replication.go b/weed/shell/command_volume_fix_replication.go
index b8daa2d9f..cf424ccc6 100644
--- a/weed/shell/command_volume_fix_replication.go
+++ b/weed/shell/command_volume_fix_replication.go
@@ -117,7 +117,7 @@ func (c *commandVolumeFixReplication) Do(args []string, commandEnv *commandEnv,
 				}
 
 				err := operation.WithVolumeServerClient(dst.dataNode.Id, commandEnv.option.GrpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
-					_, replicateErr := volumeServerClient.ReplicateVolume(ctx, &volume_server_pb.ReplicateVolumeRequest{
+					_, replicateErr := volumeServerClient.VolumeCopy(ctx, &volume_server_pb.VolumeCopyRequest{
 						VolumeId:       volumeInfo.Id,
 						Collection:     volumeInfo.Collection,
 						SourceDataNode: sourceNode.dataNode.Id,
diff --git a/weed/storage/volume_follow.go b/weed/storage/volume_backup.go
similarity index 97%
rename from weed/storage/volume_follow.go
rename to weed/storage/volume_backup.go
index 8512ec932..cb478c427 100644
--- a/weed/storage/volume_follow.go
+++ b/weed/storage/volume_backup.go
@@ -54,7 +54,7 @@ update needle map when receiving new .dat bytes. But seems not necessary now.)
 
 */
 
-func (v *Volume) Follow(volumeServer string, grpcDialOption grpc.DialOption) error {
+func (v *Volume) IncrementalBackup(volumeServer string, grpcDialOption grpc.DialOption) error {
 
 	ctx := context.Background()
 
@@ -66,7 +66,7 @@ func (v *Volume) Follow(volumeServer string, grpcDialOption grpc.DialOption) err
 
 	err = operation.WithVolumeServerClient(volumeServer, grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
 
-		stream, err := client.VolumeFollow(ctx, &volume_server_pb.VolumeFollowRequest{
+		stream, err := client.VolumeIncrementalCopy(ctx, &volume_server_pb.VolumeIncrementalCopyRequest{
 			VolumeId: uint32(v.Id),
 			Since:    appendAtNs,
 		})
diff --git a/weed/storage/volume_follow_test.go b/weed/storage/volume_backup_test.go
similarity index 100%
rename from weed/storage/volume_follow_test.go
rename to weed/storage/volume_backup_test.go