diff --git a/infinitepush/backupcommands.py b/infinitepush/backupcommands.py
--- a/infinitepush/backupcommands.py
+++ b/infinitepush/backupcommands.py
@@ -465,14 +465,15 @@
         batch.lookup(hexnode)
     batch.submit()
     lookupresults = batch.results()
+    i = 0
     try:
-        for r in lookupresults:
+        for i, r in enumerate(lookupresults):
             # iterate over results to make it throw if revision
             # was not found
             pass
         return True
     except error.RepoError as e:
-        ui.warn(_('%s\n') % e)
+        ui.warn(_('unknown revision %r\n') % remotehexnodes[i])
         return False
 
 _backuplatestinfofile = 'infinitepushlatestbackupinfo'