Snapshots in Hyper-V, checkpoints in SCVMM, diff-disks in VPC, undo in Office… can’t we all just get along?
As the terms and technologies have changed, people have gotten confused about the best use scenario/what is supported for snapshots. Here are some good recent blog posts, discussion and the FAQ to help you sort it out.
Taylor Brown's blog post explains away some of the confusion around backup/snapshot in Hyper-V: http://blogs.msdn.com/taylorb/archive/2008/08/20/backing-up-hyper-v-virtual-machines-using-windows-server-backup.aspx
How to enable Windows Server Backup support for the Hyper-V VSS Writer : http://blogs.technet.com/askcore/archive/2008/08/20/how-to-enable-windows-server-backup-support-for-the-hyper-v-vss-writer.aspx
Windows Server 2008 Backup and Recovery Overview : http://technet.microsoft.com/library/cc770593.aspx
Windows Server Backup Step-by-Step Guide for Windows Server 2008 : http://technet.microsoft.com/en-us/library/cc770266.aspx
Microsoft Data Protection Manager trial: http://technet.microsoft.com/dpm/bb727240.aspx