Duplicate backups from dedupe disk to tape for encryption

Hi, our customer is using NBU 5230 appliance (2.6.0.3), which works as both master and media server in their environment. All the clients are Windows clients and are backed up to the dedupe disk in the appliance. The appliance has connected to a IBM tape library. They use NetBackup Vault to duplicate backups from the dedupe disk to tape for offsite store. 

Recently they wants to implement KMS in the appliance. I understand that if they back up directly to tapes in the ENCR_xx pool, the backup images will be encrpted. 

My question is:

If they use Vault to duplicate backup images from dedupe disk to the tapes in ENCR_xx pool, will the backup images in the tape be encrypted? Thanks in advance.