NIS 2010 activation and disk imaging

I switch to NIS 2010 (3 pc license) recently. Since my job requires reinstallation Windows frequently,  I just found out I lost one activation already because I didn't not uninstall NIS first. 

 

I think a solution would be using a disk imaging software to backup my Windows partition in which NIS 2010 already installed & activated. 

 

My question for those who did try something similar to that: would that work ?  If I restored my Windows partition, will NIS 2010 be OK ?

 

Nathan