Implement the C++ class to write the backed up file data.
diff --git a/libs/utils/Android.mk b/libs/utils/Android.mk
index f9fb780..5a1a89b 100644
--- a/libs/utils/Android.mk
+++ b/libs/utils/Android.mk
@@ -117,7 +117,8 @@
 	IPermissionController.cpp \
 	IServiceManager.cpp \
 	Unicode.cpp \
-	file_backup_helper.cpp
+    backup_data.cpp \
+	backup_helper_file.cpp
 
 ifeq ($(TARGET_SIMULATOR),true)
 LOCAL_SRC_FILES += $(hostSources)