Paul,
One option is to use a product such as Kiwi CatTools to schedule the necessary commands on the CUE module to initiate the backup. I'm not sure how this product stores passwords, but you could certainly avoid transmitting passwords in clear text by using SSH. Also, you could use an account with limited privileges to login.
http://www.kiwisyslog.com/kiwi-cattools-overview/
Hope this helps. If so, please rate the post.
Brandon