diff --git a/partition.cpp b/partition.cpp
index f0406205..f767db68 100755
--- a/partition.cpp
+++ b/partition.cpp
@@ -1242,6 +1242,7 @@ void TWPartition::Setup_Data_Media() {
 		backup_exclusions.add_absolute_dir("/data/vendor/dumpsys");
 		backup_exclusions.add_absolute_dir("/data/cache");
         backup_exclusions.add_absolute_dir("/data/misc/apexdata/com.android.art"); // exclude this dir to prevent "error 255" on AOSP Android 12
+		backup_exclusions.add_absolute_dir("/data/extm"); //exclude this dir to prevent "error 255" on MIUI
 		wipe_exclusions.add_absolute_dir(Mount_Point + "/misc/vold"); // adopted storage keys
 		ExcludeAll(Mount_Point + "/system/storage.xml");
 	} else {