Backup to the cloud or virtual hard-drives – cloud storage by whatever name is a wonderful innovation. But when it’s called an archive, it’s not only wrong, it can be risky. Particularly if you are responsible for your company’s data.
Backing up PSTs to Box or Dropbox or some other cloud drive is certainly prudent. A small company with a relatively few email boxes can use this method rather effectively. As the number of employees grows and things invariably become more complex, a hosting partner such as Rackspace can provide exchange services and also backup the PSTs.