It's a little more in-depth than just copying things across and expecting them to work.
1. Stop your services before doing anything, including the SQL server instance of the BKUPEXEC DB. Without that happening, you won't be able to copy anything into that folder.
2. Look into running catrebuildindex -r from the installation directory of the BEWS software. This will automatically rebuild your catalogs for you.
3. Look into transferring your data using BEutility from the current backup server to the new one...this would take the least amount of time.
Laters!