GroupWise 8 backup and restore using BackupExec 2010

I have a GroupWise 8 deployment (relatively recently patched) on OES2/SLES10 (also relatively newly patched)

GroupWise is running on NSS.  The TSA is correctly configured on the Linux box.

We are backing it up with a Windows Server 2008 based install of BE2010. The backup and restore run without error, but the restored files are sparse files.

Symantec technical support barely has anyone that can even spell GroupWise.

Is anyone out there backing up GroupWise with BE2010? If so, have you successfully tested a restore?

This is a totally supported, albeit TOTALLY UNDOCUMENTED configuration on the Symtantec side.  Anybody got any skin in this game they can share?