I still not convinced, may be may question wasn't clear
imagine the following situation :
You are working on Solaris machine Ultra-80
Your this crash !!! you want to restore it quickly, How you can do that, I heard that sun can only restore data so before exploiting this restore you have first to configure your disk this is not convience compare to other OS like AIX you can restore from a backup whithout any other manipulation.
KhB