Have you tried using their Secure Online storage as backup location?
"Configure Norton 360 to back up files to Secure Online Storage
Start Norton 360.
Click Tasks & Settings.
In the Tasks & Settings window, click Change Backup Settings.
Next to Backup Location, click Change.
Click Secure Online Storage.
If prompted, type the email address and the password used to create your Norton Account."
When you do the above, you can send yout backup at their online storage. No need another service.
I recently found out about 'Adrive' an online storage site. I want to know if i can link norton 360 to Adrive, so that when it backs up my pc's files it will backup onto that site and not keep asking me for CD's.