Backup manager

Hello experts!
When running Backup manager under NT I get the error 'VOJ-00508: The "Selected Destinations' field must be supplied.". The services 'OracleServiceORCL' and 'OracleStartORCL' are running. When I try to create a job and submit this job, the Backup manager close without a message (sometimes Dr. Watson).
Oracle is new for me, but I need to create a nightly hotbackup. I've read that BM is just for ad-hoc backup. Do I have to use the at command and ocopy? Where is the documentation, which explains ocopy?

Any comments or some links would help me! Thank you very much!!!

Olaf