diff --git a/site_ansto/instrument/util/config_edit.py b/site_ansto/instrument/util/config_edit.py
index a051d82b..c94e7d9a 100755
--- a/site_ansto/instrument/util/config_edit.py
+++ b/site_ansto/instrument/util/config_edit.py
@@ -312,7 +312,7 @@ class InstConfigData(object):
                         self.config_filename + "." + str(idx + 1))
 
         if os.path.exists(self.config_filename):
-            shutil.copy(self.config_filename, self.config_filename + ".1")
+            shutil.copy2(self.config_filename, self.config_filename + ".1")
 
     def write_config_file(self):
         """ Write out InstConfigData values to the configuration file."""