Backups are driven by Retrospect 4.2.
Retrospect consists of a server and a client.
The server sits on a dedicated machine hooked up to the tape drive. The client must be installed on the machine to be backed up. The client and server software communicate back and forth, and at the specified time for back up, the server issues the backup command to the client. The client machine must be turned on to communicate to the server. Backups for administrative users and most faculty and staff are run Friday nights and Tuesday nights.