tmp.edb locked when archiving information store backups to tape.

The only problem I see with that is I want to automatically delete all the files in the backup to disk folder sent to tape after the tape job completes.  I cannot see a way to do this with a duplicate data job.  I cannot choose to delete the files in the job, and I cannot run a post command afterwards.  Is there a way to do this in a duplicate job?  Thank you.