diff --git a/prebuilt/bin/backuptool.sh b/prebuilt/bin/backuptool.sh
index 45a14e1..a20454f 100755
--- a/prebuilt/bin/backuptool.sh
+++ b/prebuilt/bin/backuptool.sh
@@ -7,6 +7,8 @@
 export S=/system
 export V=8.1
 
+export ADDOND_VERSION=1
+
 DEBUG=0
 
 # Preserve /system/addon.d in /tmp/addon.d
@@ -14,6 +16,16 @@
   rm -rf /tmp/addon.d/
   mkdir -p /tmp/addon.d/
   cp -a /system/addon.d/* /tmp/addon.d/
+    # Discard any scripts that aren't at least our version level
+    for f in /postinstall/tmp/addon.d/*sh; do
+      SCRIPT_VERSION=$(grep "^# ADDOND_VERSION=" $f | cut -d= -f2)
+      if [ -z "$SCRIPT_VERSION" ]; then
+        SCRIPT_VERSION=1
+      fi
+      if [ $SCRIPT_VERSION -lt $ADDOND_VERSION ]; then
+        rm $f
+      fi
+    done
   chmod 755 /tmp/addon.d/*.sh
 }