Change "Remote Backup" credentials

I would like to ask if it´s possible to change the credentials for REMOTE BACKUP

CSF security check advices it (see below).

So it would be great to change Port for REMOTE BACKUP and maybe use cert-auth instead of password

Check SSH on non-standard port

You should consider moving SSH to a non-standard port [currently:22] to evade basic SSH port scans. Don’t forget to open the port in the firewall first if necessary

Check SSH PasswordAuthentication

You should disable PasswordAuthentication and only allow access using PubkeyAuthentication to improve brute-force SSH security

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Not aware of remote backup port change but rest things which you mentioned can be done on the server.