Using Shadow Copy to recover from a complete server disaster

I currently run one server at my business with Small Business Server 2003 on it.  I am doing full backups to a rotation of portable hard drives that are taken off site daily.  I have been exploring different ways to backup the data that is created in between backups.  One of the solutions that I am considering is to use Shadow Copy and to store the Shadow Copies on a different physical drive (NAS device) than the drive that I am creating the copies of.  One of the questions that I have is in the event of a major server operating system crash/failure would I be able to still be able access the Shadow Copies on the NAS device with a newly installed/restored operating system?  I hope that I am asking this question clearly enough, please feel free to ask for clarification if necessary.

Thanks,

Mike