Next time around that I intend to do a backup of the original server for the same purpose of creating a duplicate but test system I should do sysprep on the original win2008 r2 server first and then make an image? Maybe not in this case because it already has a production application?
1-Machine name
2-SID (Since Windows 7/2008 family involved Newsid software cannot be used. Sysprep will do the work perfectly)
3-IP
In addition, if the major app that you have mentioned hosting a web application with particular DNS entry then you may need to create a record for it. If not its not an issue. Probably you may need to update/change the apps name aswell.