BackupExec 2010 Thin VMDK but Thick Backup

Hi,

I'm trying BackupExec 2010 R2 AVVI to backup some virtual machines on a NetApp NFS datastore. All machines have thin provisioned disks. I'm using NDBSSL transport mode.

Every time I do a backup of a thin provisioned disk, BackupExec will backup all the provisioned space and not only the used storage, resulting in overly long backup jobs.

Is anyone having the same effect? Is this VADP problem, or BackupExec problem? Any workaround?

Thanks.