Cpremote use scheduler option to schedule the backups. You can change the time of each schedule from the WHM page

The openssh service by default only accept 10 concurrent connection from an IP . So if you are using parallel backup option , sometimes the ssh/sftp connection will be slow. This is not an issue with cpremote . To increase the speed , you need to configure the remote ssh storage pool server settings as follows,

Edit /etc/ssh/sshd_config and add the following lines

       MaxSessions 100 
       UseDNS no

Now restart  the following services

      systemctl restart  sshd
      systemctl restart  systemd-logind 

You can monitor the ssh log files in /var/log/auth.log or /var/log/secure to see the connection traffic.