Hi,
Comodo Backup v3.0 uses a different storage service than the previous versions of this application, allowing the introduction of multiple interesting features such as using the online storage space as a drive.
If you have purchased storage space before the launch of Comodo Backup v3.0, you are not able yet to use your account with this version, but the data on your account will very soon be migrated to this new type of storage, thus allowing you to used it with v3.0. You will probably be notified about this change and your Account Settings section (under Comodo Online Storage tab) will provide a service password to be used with this version of the application.
After the data on your account will be migrated, check this page to see where you can find the service password to use with Comodo Backup v3.0 :
http://help.comodo.com/topic-9-1-143-1541-Troubleshooting-Login-Problems.htmlThank you.