diff --git a/stage3/EXPORT_IMAGE b/stage4/EXPORT_IMAGE
similarity index 100%
rename from stage3/EXPORT_IMAGE
rename to stage4/EXPORT_IMAGE
diff --git a/stage3/EXPORT_NOOBS b/stage4/EXPORT_NOOBS
similarity index 100%
rename from stage3/EXPORT_NOOBS
rename to stage4/EXPORT_NOOBS
diff --git a/stage4/prerun.sh b/stage4/prerun.sh
new file mode 100644
index 00000000..9acd13cb
--- /dev/null
+++ b/stage4/prerun.sh
@@ -0,0 +1,5 @@
+#!/bin/bash -e
+
+if [ ! -d "${ROOTFS_DIR}" ]; then
+	copy_previous
+fi