In relation to your setup, one Local Copy and one Cloud Copy, I would recommend the below (assuming using one MediaAgent):
- Run normal Backup to the Local MediaAgent and Local Disk Library
- Once the Backup is written to the Disk Library, we can then configure the Secondary Copy, to Aux Copy the data to the Cloud Library.
The benefit of the above is redundancy, with the Cloud Copy having longer retention then the Primary Copy.
Note - for both the above setup, we need two separate DDB, either on a single separate MediaAgent or two MediaAgent, as one DDB will be holding references for data both on the local library, and the other DDB for the Aux Copy.
Hopefully that helps