Hi BargsleyGarry-4034, thanks for the question. This service (Azure Backup) is yet to be migrated to Q&A. Please post your question directly on the MSDN forum for the service (https://social.msdn.microsoft.com/Forums/en-US/home?forum=windowsazureonlinebackup) We are actively working to onboard all services. We will make a public announcement once complete.
Thank you for your patience!
FYI: Restoring backup of SQL database to a different subscription is possible with the new Restore as Files feature. You can now restore .bak files which can be copied to any location and use to restore to any VM in any subscription/region or even on-premises.