RDX Backup Drives are the cool little units that have an interchangeable cartridge which is in fact a small 2.5” Hard Drive. The come from a variety of vendors including Dell and HP and are commonly sold with backup software designed to work with them.
You can see below Disk 6 is a 300GB RDX drive and this is how it appears in Disk Manager – note that it shows as a removable drive whereas the Disk 5 above it which is a USB hard drive appears as a normal disk drive regardless of it’s connection.
When you run the SBS 2011 Essentials backup wizard shows the disks below… you will note that the 300GB drive from above is not present. This is because the SBS team decided to NOT support these type of removable disk drives. I understand they did this due to some related to the ejection mechanism for the drives although I can’t find which SBS team member told me this back in the SBS 2008 days
So – long story short – SBS 2011 Essentials, SBS 2011 Standard and Windows Storage Server 208 R2 Essentials which all share the same backup wizard, do not support RDX backup drives at all. A shame really as this is a great method to use for the backup of these servers.
Third party vendors such as BackupAssist do support the use of RDX drives specifically, so if these are important to you, you might want to check out www.backupassist.com for more information.