--- a/tests/simplestorerepo.py	Wed Apr 04 16:00:50 2018 -0700
+++ b/tests/simplestorerepo.py	Wed Apr 04 17:53:45 2018 -0700
@@ -405,6 +405,8 @@
         return 0, 0
 
     def add(self, text, meta, transaction, linkrev, p1, p2):
+        transaction.addbackup(self._indexpath)
+
         if meta or text.startswith(b'\1\n'):
             text = filelog.packmeta(meta, text)