Most common backup failures can be self-resolved by following the troubleshooting steps listed below: Step 1: Check Azure VM health Step-by-step guide to troubleshoot backup failures To submit a support request, on the Azure support page, select Get support. You also can submit an Azure support request.
You can post your issue in these forums, or post to on Twitter. If your Azure issue is not addressed in this article, visit the Azure forums on MSDN and Stack Overflow. This article provides troubleshooting steps that can help you resolve Azure Backup errors related to communication with the VM agent and extension.