diff --git a/generated-py/bimrpc/bimrpc_pb2.py b/generated-py/bimrpc/bimrpc_pb2.py
index 6c08e21..2f37aaa 100644
--- a/generated-py/bimrpc/bimrpc_pb2.py
+++ b/generated-py/bimrpc/bimrpc_pb2.py
@@ -14,7 +14,7 @@
 from google.protobuf import empty_pb2 as google_dot_protobuf_dot_empty__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x13\x62imrpc/bimrpc.proto\x12\x06\x62imrpc\x1a\x1bgoogle/protobuf/empty.proto\"c\n\x10\x42\x61\x63kingImageSpec\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\x12\x0c\n\x04size\x18\x03 \x01(\x03\x12\x10\n\x08\x63hecksum\x18\x04 \x01(\t\x12\x13\n\x0bvirtualSize\x18\x05 \x01(\x03\"\x95\x01\n\x12\x42\x61\x63kingImageStatus\x12\r\n\x05state\x18\x01 \x01(\t\x12\x11\n\terror_msg\x18\x02 \x01(\t\x12\x19\n\x11sending_reference\x18\x03 \x01(\x05\x12\x1e\n\x16sender_manager_address\x18\x04 \x01(\t\x12\x10\n\x08progress\x18\x05 \x01(\x05\x12\x10\n\x08\x63hecksum\x18\x06 \x01(\t\"j\n\x14\x42\x61\x63kingImageResponse\x12&\n\x04spec\x18\x01 \x01(\x0b\x32\x18.bimrpc.BackingImageSpec\x12*\n\x06status\x18\x02 \x01(\x0b\x32\x1a.bimrpc.BackingImageStatus\"+\n\rDeleteRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\"(\n\nGetRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\"\xa3\x01\n\x0cListResponse\x12?\n\x0e\x62\x61\x63king_images\x18\x01 \x03(\x0b\x32\'.bimrpc.ListResponse.BackingImagesEntry\x1aR\n\x12\x42\x61\x63kingImagesEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12+\n\x05value\x18\x02 \x01(\x0b\x32\x1c.bimrpc.BackingImageResponse:\x02\x38\x01\"\xa2\x01\n\x0fVersionResponse\x12\x0f\n\x07version\x18\x01 \x01(\t\x12\x11\n\tgitCommit\x18\x02 \x01(\t\x12\x11\n\tbuildDate\x18\x03 \x01(\t\x12)\n!backing_image_manager_api_version\x18\x04 \x01(\x03\x12-\n%backing_image_manager_api_min_version\x18\x05 \x01(\x03\"K\n\x0bSyncRequest\x12&\n\x04spec\x18\x01 \x01(\x0b\x32\x18.bimrpc.BackingImageSpec\x12\x14\n\x0c\x66rom_address\x18\x02 \x01(\t\"=\n\x0bSendRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\x12\x12\n\nto_address\x18\x03 \x01(\t\"S\n\x0c\x46\x65tchRequest\x12&\n\x04spec\x18\x01 \x01(\x0b\x32\x18.bimrpc.BackingImageSpec\x12\x1b\n\x13\x64\x61ta_source_address\x18\x02 \x01(\t\"4\n\x16PrepareDownloadRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\"A\n\x17PrepareDownloadResponse\x12\x15\n\rsrc_file_path\x18\x01 \x01(\t\x12\x0f\n\x07\x61\x64\x64ress\x18\x02 \x01(\t\"\x88\x03\n\x13\x42\x61\x63kupCreateRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\x12\x10\n\x08\x63hecksum\x18\x03 \x01(\t\x12\x15\n\rbackup_target\x18\x04 \x01(\t\x12\x0e\n\x06labels\x18\x05 \x03(\t\x12?\n\ncredential\x18\x06 \x03(\x0b\x32+.bimrpc.BackupCreateRequest.CredentialEntry\x12\x1a\n\x12\x63ompression_method\x18\x07 \x01(\t\x12\x18\n\x10\x63oncurrent_limit\x18\x08 \x01(\x05\x12?\n\nparameters\x18\t \x03(\x0b\x32+.bimrpc.BackupCreateRequest.ParametersEntry\x1a\x31\n\x0f\x43redentialEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\x1a\x31\n\x0fParametersEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\"#\n\x13\x42\x61\x63kupStatusRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\"Z\n\x14\x42\x61\x63kupStatusResponse\x12\x10\n\x08progress\x18\x01 \x01(\x05\x12\x12\n\nbackup_url\x18\x02 \x01(\t\x12\r\n\x05\x65rror\x18\x03 \x01(\t\x12\r\n\x05state\x18\x04 \x01(\t2\xe3\x05\n\x1a\x42\x61\x63kingImageManagerService\x12\x39\n\x06\x44\x65lete\x12\x15.bimrpc.DeleteRequest\x1a\x16.google.protobuf.Empty\"\x00\x12\x39\n\x03Get\x12\x12.bimrpc.GetRequest\x1a\x1c.bimrpc.BackingImageResponse\"\x00\x12\x36\n\x04List\x12\x16.google.protobuf.Empty\x1a\x14.bimrpc.ListResponse\"\x00\x12=\n\nVersionGet\x12\x16.google.protobuf.Empty\x1a\x17.bimrpc.VersionResponse\x12;\n\x04Sync\x12\x13.bimrpc.SyncRequest\x1a\x1c.bimrpc.BackingImageResponse\"\x00\x12\x35\n\x04Send\x12\x13.bimrpc.SendRequest\x1a\x16.google.protobuf.Empty\"\x00\x12=\n\x05\x46\x65tch\x12\x14.bimrpc.FetchRequest\x1a\x1c.bimrpc.BackingImageResponse\"\x00\x12T\n\x0fPrepareDownload\x12\x1e.bimrpc.PrepareDownloadRequest\x1a\x1f.bimrpc.PrepareDownloadResponse\"\x00\x12\x45\n\x0c\x42\x61\x63kupCreate\x12\x1b.bimrpc.BackupCreateRequest\x1a\x16.google.protobuf.Empty\"\x00\x12K\n\x0c\x42\x61\x63kupStatus\x12\x1b.bimrpc.BackupStatusRequest\x1a\x1c.bimrpc.BackupStatusResponse\"\x00\x12;\n\x05Watch\x12\x16.google.protobuf.Empty\x1a\x16.google.protobuf.Empty\"\x00\x30\x01\x42\x30Z.github.com/longhorn/types/pkg/generated/bimrpcb\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x13\x62imrpc/bimrpc.proto\x12\x06\x62imrpc\x1a\x1bgoogle/protobuf/empty.proto\"u\n\x10\x42\x61\x63kingImageSpec\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\x12\x0c\n\x04size\x18\x03 \x01(\x03\x12\x10\n\x08\x63hecksum\x18\x04 \x01(\t\x12\x13\n\x0bvirtualSize\x18\x05 \x01(\x03\x12\x10\n\x08realSize\x18\x06 \x01(\x03\"\x95\x01\n\x12\x42\x61\x63kingImageStatus\x12\r\n\x05state\x18\x01 \x01(\t\x12\x11\n\terror_msg\x18\x02 \x01(\t\x12\x19\n\x11sending_reference\x18\x03 \x01(\x05\x12\x1e\n\x16sender_manager_address\x18\x04 \x01(\t\x12\x10\n\x08progress\x18\x05 \x01(\x05\x12\x10\n\x08\x63hecksum\x18\x06 \x01(\t\"j\n\x14\x42\x61\x63kingImageResponse\x12&\n\x04spec\x18\x01 \x01(\x0b\x32\x18.bimrpc.BackingImageSpec\x12*\n\x06status\x18\x02 \x01(\x0b\x32\x1a.bimrpc.BackingImageStatus\"+\n\rDeleteRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\"(\n\nGetRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\"\xa3\x01\n\x0cListResponse\x12?\n\x0e\x62\x61\x63king_images\x18\x01 \x03(\x0b\x32\'.bimrpc.ListResponse.BackingImagesEntry\x1aR\n\x12\x42\x61\x63kingImagesEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12+\n\x05value\x18\x02 \x01(\x0b\x32\x1c.bimrpc.BackingImageResponse:\x02\x38\x01\"\xa2\x01\n\x0fVersionResponse\x12\x0f\n\x07version\x18\x01 \x01(\t\x12\x11\n\tgitCommit\x18\x02 \x01(\t\x12\x11\n\tbuildDate\x18\x03 \x01(\t\x12)\n!backing_image_manager_api_version\x18\x04 \x01(\x03\x12-\n%backing_image_manager_api_min_version\x18\x05 \x01(\x03\"K\n\x0bSyncRequest\x12&\n\x04spec\x18\x01 \x01(\x0b\x32\x18.bimrpc.BackingImageSpec\x12\x14\n\x0c\x66rom_address\x18\x02 \x01(\t\"=\n\x0bSendRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\x12\x12\n\nto_address\x18\x03 \x01(\t\"S\n\x0c\x46\x65tchRequest\x12&\n\x04spec\x18\x01 \x01(\x0b\x32\x18.bimrpc.BackingImageSpec\x12\x1b\n\x13\x64\x61ta_source_address\x18\x02 \x01(\t\"4\n\x16PrepareDownloadRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\"A\n\x17PrepareDownloadResponse\x12\x15\n\rsrc_file_path\x18\x01 \x01(\t\x12\x0f\n\x07\x61\x64\x64ress\x18\x02 \x01(\t\"\x88\x03\n\x13\x42\x61\x63kupCreateRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x0c\n\x04uuid\x18\x02 \x01(\t\x12\x10\n\x08\x63hecksum\x18\x03 \x01(\t\x12\x15\n\rbackup_target\x18\x04 \x01(\t\x12\x0e\n\x06labels\x18\x05 \x03(\t\x12?\n\ncredential\x18\x06 \x03(\x0b\x32+.bimrpc.BackupCreateRequest.CredentialEntry\x12\x1a\n\x12\x63ompression_method\x18\x07 \x01(\t\x12\x18\n\x10\x63oncurrent_limit\x18\x08 \x01(\x05\x12?\n\nparameters\x18\t \x03(\x0b\x32+.bimrpc.BackupCreateRequest.ParametersEntry\x1a\x31\n\x0f\x43redentialEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\x1a\x31\n\x0fParametersEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\"#\n\x13\x42\x61\x63kupStatusRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\"Z\n\x14\x42\x61\x63kupStatusResponse\x12\x10\n\x08progress\x18\x01 \x01(\x05\x12\x12\n\nbackup_url\x18\x02 \x01(\t\x12\r\n\x05\x65rror\x18\x03 \x01(\t\x12\r\n\x05state\x18\x04 \x01(\t2\xe3\x05\n\x1a\x42\x61\x63kingImageManagerService\x12\x39\n\x06\x44\x65lete\x12\x15.bimrpc.DeleteRequest\x1a\x16.google.protobuf.Empty\"\x00\x12\x39\n\x03Get\x12\x12.bimrpc.GetRequest\x1a\x1c.bimrpc.BackingImageResponse\"\x00\x12\x36\n\x04List\x12\x16.google.protobuf.Empty\x1a\x14.bimrpc.ListResponse\"\x00\x12=\n\nVersionGet\x12\x16.google.protobuf.Empty\x1a\x17.bimrpc.VersionResponse\x12;\n\x04Sync\x12\x13.bimrpc.SyncRequest\x1a\x1c.bimrpc.BackingImageResponse\"\x00\x12\x35\n\x04Send\x12\x13.bimrpc.SendRequest\x1a\x16.google.protobuf.Empty\"\x00\x12=\n\x05\x46\x65tch\x12\x14.bimrpc.FetchRequest\x1a\x1c.bimrpc.BackingImageResponse\"\x00\x12T\n\x0fPrepareDownload\x12\x1e.bimrpc.PrepareDownloadRequest\x1a\x1f.bimrpc.PrepareDownloadResponse\"\x00\x12\x45\n\x0c\x42\x61\x63kupCreate\x12\x1b.bimrpc.BackupCreateRequest\x1a\x16.google.protobuf.Empty\"\x00\x12K\n\x0c\x42\x61\x63kupStatus\x12\x1b.bimrpc.BackupStatusRequest\x1a\x1c.bimrpc.BackupStatusResponse\"\x00\x12;\n\x05Watch\x12\x16.google.protobuf.Empty\x1a\x16.google.protobuf.Empty\"\x00\x30\x01\x42\x30Z.github.com/longhorn/types/pkg/generated/bimrpcb\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -30,41 +30,41 @@
   _BACKUPCREATEREQUEST_PARAMETERSENTRY._options = None
   _BACKUPCREATEREQUEST_PARAMETERSENTRY._serialized_options = b'8\001'
   _globals['_BACKINGIMAGESPEC']._serialized_start=60
-  _globals['_BACKINGIMAGESPEC']._serialized_end=159
-  _globals['_BACKINGIMAGESTATUS']._serialized_start=162
-  _globals['_BACKINGIMAGESTATUS']._serialized_end=311
-  _globals['_BACKINGIMAGERESPONSE']._serialized_start=313
-  _globals['_BACKINGIMAGERESPONSE']._serialized_end=419
-  _globals['_DELETEREQUEST']._serialized_start=421
-  _globals['_DELETEREQUEST']._serialized_end=464
-  _globals['_GETREQUEST']._serialized_start=466
-  _globals['_GETREQUEST']._serialized_end=506
-  _globals['_LISTRESPONSE']._serialized_start=509
-  _globals['_LISTRESPONSE']._serialized_end=672
-  _globals['_LISTRESPONSE_BACKINGIMAGESENTRY']._serialized_start=590
-  _globals['_LISTRESPONSE_BACKINGIMAGESENTRY']._serialized_end=672
-  _globals['_VERSIONRESPONSE']._serialized_start=675
-  _globals['_VERSIONRESPONSE']._serialized_end=837
-  _globals['_SYNCREQUEST']._serialized_start=839
-  _globals['_SYNCREQUEST']._serialized_end=914
-  _globals['_SENDREQUEST']._serialized_start=916
-  _globals['_SENDREQUEST']._serialized_end=977
-  _globals['_FETCHREQUEST']._serialized_start=979
-  _globals['_FETCHREQUEST']._serialized_end=1062
-  _globals['_PREPAREDOWNLOADREQUEST']._serialized_start=1064
-  _globals['_PREPAREDOWNLOADREQUEST']._serialized_end=1116
-  _globals['_PREPAREDOWNLOADRESPONSE']._serialized_start=1118
-  _globals['_PREPAREDOWNLOADRESPONSE']._serialized_end=1183
-  _globals['_BACKUPCREATEREQUEST']._serialized_start=1186
-  _globals['_BACKUPCREATEREQUEST']._serialized_end=1578
-  _globals['_BACKUPCREATEREQUEST_CREDENTIALENTRY']._serialized_start=1478
-  _globals['_BACKUPCREATEREQUEST_CREDENTIALENTRY']._serialized_end=1527
-  _globals['_BACKUPCREATEREQUEST_PARAMETERSENTRY']._serialized_start=1529
-  _globals['_BACKUPCREATEREQUEST_PARAMETERSENTRY']._serialized_end=1578
-  _globals['_BACKUPSTATUSREQUEST']._serialized_start=1580
-  _globals['_BACKUPSTATUSREQUEST']._serialized_end=1615
-  _globals['_BACKUPSTATUSRESPONSE']._serialized_start=1617
-  _globals['_BACKUPSTATUSRESPONSE']._serialized_end=1707
-  _globals['_BACKINGIMAGEMANAGERSERVICE']._serialized_start=1710
-  _globals['_BACKINGIMAGEMANAGERSERVICE']._serialized_end=2449
+  _globals['_BACKINGIMAGESPEC']._serialized_end=177
+  _globals['_BACKINGIMAGESTATUS']._serialized_start=180
+  _globals['_BACKINGIMAGESTATUS']._serialized_end=329
+  _globals['_BACKINGIMAGERESPONSE']._serialized_start=331
+  _globals['_BACKINGIMAGERESPONSE']._serialized_end=437
+  _globals['_DELETEREQUEST']._serialized_start=439
+  _globals['_DELETEREQUEST']._serialized_end=482
+  _globals['_GETREQUEST']._serialized_start=484
+  _globals['_GETREQUEST']._serialized_end=524
+  _globals['_LISTRESPONSE']._serialized_start=527
+  _globals['_LISTRESPONSE']._serialized_end=690
+  _globals['_LISTRESPONSE_BACKINGIMAGESENTRY']._serialized_start=608
+  _globals['_LISTRESPONSE_BACKINGIMAGESENTRY']._serialized_end=690
+  _globals['_VERSIONRESPONSE']._serialized_start=693
+  _globals['_VERSIONRESPONSE']._serialized_end=855
+  _globals['_SYNCREQUEST']._serialized_start=857
+  _globals['_SYNCREQUEST']._serialized_end=932
+  _globals['_SENDREQUEST']._serialized_start=934
+  _globals['_SENDREQUEST']._serialized_end=995
+  _globals['_FETCHREQUEST']._serialized_start=997
+  _globals['_FETCHREQUEST']._serialized_end=1080
+  _globals['_PREPAREDOWNLOADREQUEST']._serialized_start=1082
+  _globals['_PREPAREDOWNLOADREQUEST']._serialized_end=1134
+  _globals['_PREPAREDOWNLOADRESPONSE']._serialized_start=1136
+  _globals['_PREPAREDOWNLOADRESPONSE']._serialized_end=1201
+  _globals['_BACKUPCREATEREQUEST']._serialized_start=1204
+  _globals['_BACKUPCREATEREQUEST']._serialized_end=1596
+  _globals['_BACKUPCREATEREQUEST_CREDENTIALENTRY']._serialized_start=1496
+  _globals['_BACKUPCREATEREQUEST_CREDENTIALENTRY']._serialized_end=1545
+  _globals['_BACKUPCREATEREQUEST_PARAMETERSENTRY']._serialized_start=1547
+  _globals['_BACKUPCREATEREQUEST_PARAMETERSENTRY']._serialized_end=1596
+  _globals['_BACKUPSTATUSREQUEST']._serialized_start=1598
+  _globals['_BACKUPSTATUSREQUEST']._serialized_end=1633
+  _globals['_BACKUPSTATUSRESPONSE']._serialized_start=1635
+  _globals['_BACKUPSTATUSRESPONSE']._serialized_end=1725
+  _globals['_BACKINGIMAGEMANAGERSERVICE']._serialized_start=1728
+  _globals['_BACKINGIMAGEMANAGERSERVICE']._serialized_end=2467
 # @@protoc_insertion_point(module_scope)
diff --git a/pkg/generated/bimrpc/bimrpc.pb.go b/pkg/generated/bimrpc/bimrpc.pb.go
index cc04fa9..d605864 100644
--- a/pkg/generated/bimrpc/bimrpc.pb.go
+++ b/pkg/generated/bimrpc/bimrpc.pb.go
@@ -31,6 +31,7 @@ type BackingImageSpec struct {
 	Size        int64  `protobuf:"varint,3,opt,name=size,proto3" json:"size,omitempty"`
 	Checksum    string `protobuf:"bytes,4,opt,name=checksum,proto3" json:"checksum,omitempty"`
 	VirtualSize int64  `protobuf:"varint,5,opt,name=virtualSize,proto3" json:"virtualSize,omitempty"`
+	RealSize    int64  `protobuf:"varint,6,opt,name=realSize,proto3" json:"realSize,omitempty"`
 }
 
 func (x *BackingImageSpec) Reset() {
@@ -100,6 +101,13 @@ func (x *BackingImageSpec) GetVirtualSize() int64 {
 	return 0
 }
 
+func (x *BackingImageSpec) GetRealSize() int64 {
+	if x != nil {
+		return x.RealSize
+	}
+	return 0
+}
+
 type BackingImageStatus struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -996,7 +1004,7 @@ var file_bimrpc_bimrpc_proto_rawDesc = []byte{
 	0x0a, 0x13, 0x62, 0x69, 0x6d, 0x72, 0x70, 0x63, 0x2f, 0x62, 0x69, 0x6d, 0x72, 0x70, 0x63, 0x2e,
 	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x06, 0x62, 0x69, 0x6d, 0x72, 0x70, 0x63, 0x1a, 0x1b, 0x67,
 	0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f, 0x65,
-	0x6d, 0x70, 0x74, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x8c, 0x01, 0x0a, 0x10, 0x42,
+	0x6d, 0x70, 0x74, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xa8, 0x01, 0x0a, 0x10, 0x42,
 	0x61, 0x63, 0x6b, 0x69, 0x6e, 0x67, 0x49, 0x6d, 0x61, 0x67, 0x65, 0x53, 0x70, 0x65, 0x63, 0x12,
 	0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e,
 	0x61, 0x6d, 0x65, 0x12, 0x12, 0x0a, 0x04, 0x75, 0x75, 0x69, 0x64, 0x18, 0x02, 0x20, 0x01, 0x28,
@@ -1005,186 +1013,187 @@ var file_bimrpc_bimrpc_proto_rawDesc = []byte{
 	0x68, 0x65, 0x63, 0x6b, 0x73, 0x75, 0x6d, 0x18, 0x04, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x63,
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 }
 
 var (
diff --git a/protobuf/bimrpc/bimrpc.proto b/protobuf/bimrpc/bimrpc.proto
index e3ef138..5b7c338 100644
--- a/protobuf/bimrpc/bimrpc.proto
+++ b/protobuf/bimrpc/bimrpc.proto
@@ -27,6 +27,7 @@ message BackingImageSpec {
 	int64 size = 3;
 	string checksum = 4;
 	int64 virtualSize = 5;
+	int64 realSize = 6;
 }
 
 message BackingImageStatus {