Add a client to tykbackup

Make sure the folder /root/.ssh exists, and run the command below to allow the backup server to log in as root using ssh:

echo "ssh-rsa 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 root@backup.tyknet.dk" >> /root/.ssh/authorized_keys

Also change PermitRootLogin no to yes in /etc/ssh/sshd_config, the (sensible) default in FreeBSD is to not allow root logins over ssh. Consider disallowing password logins and use key login only, and consider firewalling ssh.