Clarification on the SSH config option

Hi Jose, thanks a lot for this.

I'm reading the sample config, I think I understood most of the options, but I have a question:

```
# Set SSH parameters, e.g. "root@192.168.1.250".
SSH_NET_PARAMS="-q -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no root@192.168.1.250"
```

What is SSH used for? What should be the IP, OPNsense or the remote backup server?