Raid 5 to Raid 1 and system restore.

I have a Win2003 DC which has 4 72GB SAS drives configured in a RAID 5.

I want to pull out 2 of the drives to use on another server and configure the other 2 drives as RAID 1.

I have a backup of the DC from the Windows backup util.

Could I easily rebuild the server and then restore my backup?

Thanks for all the help.