Storage polciy to snap, aux between datacenters with a vault, and then backup copy to tape. Backup and Aux work. However, when I kick off the backup copy, it says no jobs found even though when I look at the jobs for the copy, it says there is one to be copied. So I started a new backup and told it to create a Backup Copy immediately, which failed because of the pending jobs in the backup copy.
In the Commvault world I came from, I'd have done this with Backup, DASH Copy, Aux copy. That was without snapshots though so it's a brave new world now.