Hi.
What you need to know if you are going to test a Disaster Recovery.

Re-installation:
If you going to re-installation the OS you need to know on which Service Pack 
and hot fix level that machine is on and which Application SP/Hot Fix level its 
runs on.
Because you need to install everything in the same level it's was before and 
join the domain before the restore if you want the result to be ok. But in this 
case your application can get other issues that you haven't see before. And 
another things who happenings if you don't have the system in the same level as 
before is that the system shows you got the correct version of hot fixes ans 
Service pack but it doesn't in file level.

Image/BMR Tools:
If you going to use images technology or another BMR tool you need to know if 
the Backup can backup open files another wise you need to bring down the system 
and make a offline image.
When you restore the images you need to boot up on a temporary OS in the memory 
on another hard disk, if you don't do that you can't over write all files and 
you will got a corrupt system.

If you want to try the IBM TSM official BMR tool you can download a evolution 
from Cristie Data Products Ltd website (www.cristie.com)
One thing who is missing in the most BMR tools is that if you backing up old 
server and when you going to restore to the new hardware then is the Disk 
controller been change and the image/backup you recover doesn't have install 
that new disk controller driver and when Windows start up you got a blue screen.

Cristie Bare Machine Recovery has a solution for that who works...

Best Regards
Christian Svensson