diff --git a/docs/backup-guide.rst b/docs/backup-guide.rst
index a3c15af..67d08d0 100644
--- a/docs/backup-guide.rst
+++ b/docs/backup-guide.rst
@@ -19,6 +19,8 @@ If you enabled ``enableManageSieve`` then you also may want to backup
 The same considerations regarding file ownership apply as for the
 Maildir.
 
+To backup spam and ham training data, backup ``/var/lib/redis-rspamd``.
+
 Finally you can (optionally) make a backup of ``/var/dkim`` (or whatever
 you specified as ``dkimKeyDirectory``). If you should lose those don’t
 worry, new ones will be created on the fly. But you will need to repeat