backup to router and scp to local pc

I want to make my openwrt backup with command from my local terminal, pretty easy, but my problem is after that, it is when I try to bring back the backup to my local pc. Here what I have for now, first part is ok:

#!/bin/bash

ssh root@192.168.1.1 sysupgrade --create-backup /tmp/main_backup.tar.gz

with that command I create my router's backup and I want to scp that backup to my local pc.