Run postgresql backup as postgres user

ckupeye

@@ -190,7 +190,7 @@ fi
 if $EXPORT_POSTGRESQL
 then
     echo → Exporting PostgreSQL
-    pg_dumpall $EXPORT_POSTGRESQL_OPTIONS | _feedExport "$EXPORT_POSTGRESQL_FILE"
+    sudo -u postgres pg_dumpall $EXPORT_POSTGRESQL_OPTIONS | _feedExport "$EXPORT_POSTGRESQL_FILE"
     EXPORT_FILES="$EXPORT_POSTGRESQL_FILE $EXPORT_FILES"
 fi