You can run a script to archive your SnapManager backup copies to tape using Exchange Backup Agent. The script launches NTBackup and tells it to perform a copy-type backup operation through the Exchange Backup Agent.
Before you can use this script, you need to use the Windows NTBackup GUI to create a .BKS file that contains the Storage Groups you want to back up. This script assumes that it is run on the computer running Exchange and SnapManager.
REM Launch NTBackup ntbackup backup "@c:\MyConfig.BKS" /M copy