Azure's Architecture and Best Practices for Disaster Recovery
Do you know why a lot of businesses that use vital business apps set up Azure Disaster Recovery with high availability?  

due to the fact that most firms require it. Following a large natural disaster or man-made disaster, Azure Disaster Recovery is a collection of policies and a suite of tools to enable recovery and resume major IT infrastructure. 

More specifically, Microsoft's disaster recovery plan can be designed for the whole Azure IT environment, thus you will also need to take non-SAP apps into account. Therefore, you will need to restore your assets or dependant services on the DR site in order for the SAP applications to function properly. 

Learn everything there is to know about Azure Disaster Recovery.