Error 5580: The specified failover strategy for the storage unit group is incompatible with the Cloud object store policy, with dynamic multi-streaming.

Explanation:

This occurs when the storage unit group is incompatible with the Cloud object store policy.

Workaround:

To change storage unit selection:

In the NetBackup UI, on the left, click Storage, then click Storage units. Click the Storage unit group tab.
Click Add to add a new storage unit, or edit an existing one.
Under Storage unit selection options, select any of these options as required: Prioritized, Round Robin, or Media Server Load Balancing.

Retry the backup.