Depending on the specific version of CMS you may have a variety of options available. On CMS 16/17 I have been using NFS to backup systems to a Linux system (Windows NFS is not supported). You need to understand Linux NFS, Firewalls, and scripting. I build a script to look for the mount prior to the backup and if the system is not mounted then I mount the NFS share. Either the Admin or Maintenance manual covers the actual running of the backup but you will need to build the NFS mount on your own.