Looking at System Centre Data Protection Manager and found a slide that mentioned offsite recovery and tape .. so I dug some more and found this:
LONDON (April 20, 2010) – Iron Mountain, an information management services company, today announced a new release of its CloudRecovery® solution for Microsoft® System Center Data Protection Manager (DPM). With Iron Mountain’s CloudRecovery solution, Microsoft DPM customers can automatically protect their business data with Iron Mountain’s secure cloud for short-and long-term, off-site storage. This release includes support for DPM 2010, multi-terabyte scalability and new options for additional data protection.
Humm, so you could use DPM to backup Exchange 2010 and once a week offsite a backup to Iron Mountain .. could save on a hell of a lot of backup tapes!