Using VHD backups for DR

So, an idea I am tossing around in my head, for updating our DR plan is:

6 servers all running windows 2008 R2
2 DC
1 Exchange
2 ERP (1 MS SQL, 1 program server)

So my idea is,

1-have some windows virtual servers setup at some place like rackspace
2-using VHD images from my servers,  spin up the virtual servers there
3-Make any necessary DNS changes and we are up and running.

Is this remotely doable? or is there an easier/better way?
I am trying to come up with a way other than using a coloc site and having 50k or more of hardware collecting dust till I need them.
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If you use shadowprotect from storagecraft as backup utility, you can do that easily. You can start the backups using VirtualBox and be online again after a minimum of downtime. Of course the speed to the VM's will be slower, but that is only temporary until you have replaced the broken server, or fixed it:
Lionel MMSmall Business IT ConsultantCommented:
If you have Windows backup files, full metal backups, and or Hyper-V backups, created using Windows backups you can use those to create new VMs and/or restore to a new server.
using disk images for DR has it's issues with many applications as the databases are only updated sporadically. it does work in theory though and can be workable if planned correctly.

Two things to consider:

What applications would be affected when you activated a DR server based on a VHD?
Exchange, SQL & Active Directory all suffer corruption when 'backed up' in this way as the database isn't in a clean 'shutdown' state when the backup is taken.

How would the amount of data affect the process?
De-duplication is what you need, but it's quite expensive as most low end backup imaging software doesn't include it.
Without de-dupe your entire disk/vhd would be backed up causing a lot of potentially wasted traffic.

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