In tip 2849, I explained that NTBackup only backs up to devices that RSM supports.
You can, however, fake it out by backing up to a file on the unsupported device:
1. If you don't have a NIC, install the LoopBack adapter.
2. Create a share at the root of the media, calling it backup$.
3. In NTBackup, choose File in Backup media type.
4. In Backup media or file name, enter \\YourComputerName\Backup$\Date_Time_Description.bkf.
NOTE: See tip 3143.