Our current backup scheme is to backup all of our servers to a NAS device, and swap it out with another one occasionally. Of course, this is no fun to manage, so we've been evaluating Microsoft's DPM.
So far, DPM looks like it will work great, but the only thing I haven't been able to figure out is how we can copy the backup data from DPM to a NAS or other external device other than tape to be moved offsite.
We are looking at Iron Mountain's CloudRecovery solution, but wanted to also look at a sneakernet solution, if possible.