I had the same problem, so I emailed support and got the following reply -
"If Adaptec ASPI driver has not enabled the CDRW option, please install Nero's ASPI driver (by Ahead Software): Please copy the file wnaspi32.dll attached to this letter to Handy Backup directory on your machine: C:\Program Files\Novosoft\Handy Backup\. Then, please try to select the CDRW option again. This should fix the problem."
That fixed it for me, give it a try.
Simon.
PS: driver file attached to this post
"If Adaptec ASPI driver has not enabled the CDRW option, please install Nero's ASPI driver (by Ahead Software): Please copy the file wnaspi32.dll attached to this letter to Handy Backup directory on your machine: C:\Program Files\Novosoft\Handy Backup\. Then, please try to select the CDRW option again. This should fix the problem."
That fixed it for me, give it a try.
Simon.
PS: driver file attached to this post