Heard Single Instance Storage mentioned on a recent podcast, here's some more info

[tinkererguy]

I recently wrote something up about Single Instance Storage, and how it's saved my skin for nearly 3 years on WHSv1. For example, I've avoided the identical games on 2 systems I backup from taking up 2x as much space in the PC backups database.

 

Thought you might be interested in more details here:

http://tinkertry.com/whywss2008r2essentials