As of release 6.2, Quest Rapid Recovery supports Azure Stack. It is available in the Azure Marketplace items available for Azure Stack listed under "Quest Rapid Recovery Core."
Azure Stack is Microsoft's proprietary answer to the open source OpenStack platform. Essentially, Azure Stack is a hybrid cloud software solution (based on the Azure cloud platform) that organizations can use in their own data centers. In other words, it is an on-premises cloud service instead of a service hosted in Microsoft's cloud. In practice, users could seamlessly move from their private cloud to the Azure public cloud if needed.
Azure and Azure Stack share a standardized architecture, including the same portal, a unified application model, and common tools.