Hi Neville_Sears,
had the same issue because the server guys thought the Home Directory don't need to be listed.
You can double check by login to the Backupserver with the Backup User via SSH > cd into the Backup Directory and then run the command "pwd". Then you will see the whole Directory Path which is needed.
SSH IP: BackupServer IP
Server Path: /backupuserhome/backupdirectory
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