We use Addonics - works well for us. Windows Server 2003 recognizes when a drive (in a drive tray) is removed or inserted.
We are just now testing how Backup Exec 2010 R2 SP1 handles this - hence my question about B2D or R-B2D.
The Backup Exec 2010 documentation lists using Removable B2D for removable disk drives (we use removable, hot swappable SATA drives).
What are the advantages in using B2D in this case?