Instructions for adding ssh pub key on the remote backup server.
Replace the USERNAME with the existing username on the remote server, it's not recommended to use the root user.

This instructions are only for the backups on the remote server.
To Enable remote backup in your CWP.admin go to CWP Settings --> Backup Configuration

You will need to enter the login details into the fields of "Remote Backup Settings"
Don't forget to generate the new remote access Key.

On the remote backup server you need to add the pub key
mkdir .ssh
chmod 700 .ssh
nano .ssh/authorized_keys

Now add all content from the file /root/.ssh/backup/ to .ssh/authorized_keys
chmod 600 .ssh/authorized_keys
chown USERNAME:USERNAME .ssh/authorized_keys

You can use test connection button in CWP.admin to check connectivity with the remote backup server.

To connect and check content on the backup server you can use ssh key access:

ssh USERNAME@SERVER-IP -i /root/.ssh/backup/id_rsa -p 22