It has. When you're looking at virtual machines, there are a few things you need to consider. The restore process can be just as it has been traditionally. If you have an agent-based backup system, you can restore a single file back into the virtual machine just as we have in the past.
But, if you are doing system-level backups where you are backing up the entire virtual machine image, you have to restore the entire virtual machine image. This can be very time consuming. Once you recover it, you have to mount it somewhere in a virtualized environment. Often, this is not the production environment because you can have conflicts with something else that's running there. Once you mount it, you can recover files from that point and transfer them back to where they need to be.
Check out the entire Virtual server backup FAQ