Hello, The following explanation shall assist your understanding to formalize a Solution.

To transport the first set of data, use the following method and then schedule a duplicate backup job to start optimized duplication.

1. Back up your data to disk or to tape using Backup Exec
2. Transport the tape or disk to the destination system (CAS or MMS)
3. On the destination, inventory and catalog the data.
4. Create a duplicate backup job from the disk or the tape to the Deduplication storage folder.
5. After successful completion of the duplicate backup job from the disk or the tape to the Deduplication storage folder, create an Optimized Duplicate backup job between the two servers involved

 Optimized duplication is a feature that allows the Backup Exec media server to track backups regardless of where the deduplication device may replicate them, so any Backup Exec media servers can be aware of data that lives in several places. Without optimized duplication support, Backup Exec would not be aware of copies of data and manual inventory and cataloging operation would be required. We can also set separate retention periods for the various backup sets, allowing for different retention periods for different sites. When used with appliances, optimized duplication offers improved operational efficiencies because the hardware device does the actual deduplication and off-loading of the processes from the media server.

After configuring optimized duplication with Backup Exec, you will have an onsite copy, offsite or DR copy, and a long-term-retention copy on tape.