diff --git a/protos/backup.proto b/protos/backup.proto
new file mode 100644
index 0000000..3780bc5
--- /dev/null
+++ b/protos/backup.proto
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+ package launcher_backup;
+
+option java_package = "com.android.launcher3.backup";
+option java_outer_classname = "BackupProtos";
+
+message Key {
+  enum Type {
+    FAVORITE = 1;
+    SCREEN = 2;
+    IMAGE = 3;
+  }
+  required Type type = 1;
+  optional string name = 2;  // keep this short
+  optional int64 id = 3;
+  optional int64 checksum = 4;
+}
+
+message CheckedMessage {
+  required bytes payload = 1;
+  required int64 checksum = 2;
+}
+
+message Journal {
+  required int32 app_version = 1;
+  required int64 t = 2;
+  optional int64 bytes = 3;
+  optional int32 rows = 4;
+  repeated Key key = 5;
+}
+
+message Favorite {
+  required int64 id = 1;
+  required int32 itemType = 2;
+  optional string title = 3;
+  optional int32 container = 4;
+  optional int32 screen = 5;
+  optional int32 cellX = 6;
+  optional int32 cellY = 7;
+  optional int32 spanX = 8;
+  optional int32 spanY = 9;
+  optional int32 displayMode = 10;
+  optional int32 appWidgetId = 11;
+  optional string appWidgetProvider = 12;
+  optional string intent = 13;
+  optional string uri = 14;
+  optional int32 iconType = 15;
+  optional string iconPackage = 16;
+  optional string iconResource = 17;
+  optional bytes icon = 18;
+ }
+
+message Screen {
+  required int64 id = 1;
+  optional int32 rank = 2;
+ }
+
+message Resource {
+  required int32 dpi = 2;
+  required bytes data = 3;
+ }