--- a/doc/book/en/admin/additional-tips.rst	Tue Mar 02 21:48:36 2010 +0100
+++ b/doc/book/en/admin/additional-tips.rst	Fri Feb 26 17:00:42 2010 +0100
@@ -28,7 +28,7 @@
 
 Simply use the pg_dump in a cron ::
 
-    pg_dump -Fc --username=cubicweb --no-owner --file=/var/lib/cubicweb/backup/<instance>-$(date '+%Y-%m-%d_%H:%M:%S').dump
+    su -c "pg_dump -Fc --username=cubicweb --no-owner" postgres > <your-instance>-$(date '+%Y-%m-%d_%H:%M:%S').dump
 
 **CubicWeb way**