blogVault has been a HUGE lifesaver for us in many ways. Backing up and restoring is so surprisingly easy, it's scary. blogVault has also pretty much transformed the process by which we migrate sites from a lengthy, error-prone process, to a one-click action.
Lastly, I can't emphasize enough how great the blogVault team has been. Their support is amazing and they have been super responsive to all our needs.