If you replace with another SRCU42E, the RAID setting can be imported and you don't have to reinstall OS. SRCU42E is the latest Intel SCSI RAID controller so I guess you won't replace it with a different model...
I've updates everything to the latest firmware/drivers. This doesn't make any difference.
It looks like the server is hanging when NTbackup is using Volume Shadow Copy. Also copying a large amount of data between parttions causes a hang of windows.