Question : How do I automate the backup of VHD files

I have several servers running VHDs under Hyper - V, located at different sites. The guest operating systems are usually 2003R232  and the hosts are 2008 standard 64. I would like to suspend the VHDs at night, back them up to an external physical disk and then restart the VHDs. I would like this to be automated.

Answer : How do I automate the backup of VHD files

The better option is to go for any backup/restore softwares which has the capability to backup VHD's using VSS Snapshot.

There are softwares like CA Arcserve backup, Symantech Backup Exec etc..