How to automate Hyper-V Snapshots?

I have a Windows 2008 server with two virtual machines in Hyper-V, how can I automate the process of taking a daily snapshot and automatically deleting those older than 7 days?

From serverfault holiveira

• Are you using snapshots as backups?

  From Dusty

• Basically you'll end up using powershell - here's a first stepping stone.

  From Chopper3