If you had not already done so please review the following technotes:
You may also want to review Chapter 3 - Best Practices for backing up in the Symantec Backup Exec System Recovery User's Guide.
First and foremost, prior to the attempted restore, check the recovery disk that will be use; while the system is still up and running you should do the following:
(1) Run the driver validation test from the recovery disk on the working system to verify all drivers needed for the recovery environment are present on the disk. To learn more about driver validation please check out the follow technote:
If drivers are reported missing, and you see what is reported missing is valid hardware review the directions in the following technote:
(2) During scheduled downtime of the server, use the recovery disk to boot the system to verify that the mass-storage controller and the network card work correctly. Attempt to map a network drive to test the network connection, and for the drives from the main menu within the recovery environment choose UTILITIES > Partition operations > Select the drive in question > View/Edit record the values shown. Boot back into windows and run the Partinfo.exe utility found in \Program Files\Symantec\Backup Exec System Recovery\Utility compare the two sets of values.
If you replaced just the drives that makes up the RAID controller and not the RAID controller itself, the system will not need to use the restore anyware option. Depending upon the size difference and the desire to increase the size of each partition of the SBS system, the choice of whether or not to use the System index file or simply browse to the image file one-by-one would need to be taken into consideration at the time of restore.
Other considerations are the restore options used; please review the following technote to understand the need and use of each restore option possible during a restore process:
Various restore options that are available in Symantec Backup Exec System Recovery (BESR)
http://support.veritas.com/docs/293021