Using an FTP server as your Offsite Copy destination is similar to using a network path. You must provide a valid FTP path to the FTP server.
You must also provide the correct FTP connection information to Norton Ghost in order for this method to work correctly. When Offsite Copy is configured correctly, it copies recovery points to the directory that you specified on the FTP server. If the server becomes unavailable for a period of time, Offsite Copy copies all recovery points that were created since the last connection. If there is no room to hold all of the recovery points available, Offsite Copy removes the oldest recovery points or recovery point sets from the FTP server. In turn, it makes room for the newest recovery points.
See Configuring default FTP settings for use with Offsite Copy.