How about the other way? I like the Slicehost image management system but it seems you need to roll your own to backup things to another geographic region.
(The largest quake in US history was in 1812 about 150 miles south of St. Louis, and if repeated that region isn't as prepared as California... and there are all sorts of other lesser mishaps that could take a whole datacenter down.)
While the region as a whole is not as prepared, there are many facilities that take the quake threat very seriously. I know nothing of Slicehost's space, but there are many buildings that meet California earthquake standards in the Midwest. (The affected region around the New Madrid is much larger due to the clay-based nature of the soil.)
