There's a common misunderstanding about a proper backup & restore procedure for an SBS and EBS 2008 server running as a virtual machine. "Many customers are taking "snapshots" in their chosen hypervisors under the assumption that they can successfully restore them in disaster recovery or migration scenarios. Another method is the use of 3rd party backup solutions that create volume images of the server and store them in a centralized network location," stated Microsoft. This post shed light as to why methods like these're unsupported, what's the supported procedures, and how to recover from an improper restoration of SBS /EBS server.
Backup Restore Methods for EBS-SBS 2008 in a Virtual Machine Environment