fix case where destination does not yet exist - no backup can be made

copy

@@ -75,6 +75,7 @@ def main():
     if md5sum_src != md5sum_dest:
         try:
             if backup:
+                if os.path.exists(dest):
                     success, msg = backuplocal(dest)
                     if not success:
                         module.fail_jason(msg=msg)