1. Make a new task to allow for scheduling of the job to run as needed and. Provide the task a meaningful name like 'Repository Cleanup task (30 days)'.
2. Create a new job in the task. The type will be 'Repository cleanup'.
3. Select the repository to cleanup.
4. Set the time-frame to be 'older than' the desired interval.
5. Select the InTrust server and then provide the job a name like 'Repository cleanup (30 days)'.
6. Either wait for the 1st scheduled run of the task or run the task manually to have it start the 1st cleanup immediately.