Wow! Thanks James.
As a side note, are you having problems backing up your exchange servers fast enough without snaps? One thing (I believe) you lose is the ability to use the Recovery Storage Group which (at least for us) is invaluable. I guess from a DR perspective, you can get your Exchange server up and running quicker. Our procedure is basically:
1) Run only streaming backups.
2) In disaster, setup 'dial-tone' mailboxes in exchange for critical users.
3) Restore historical data at leisure using recovery storage group.
Aaron