With SQL Server Stretch Database, you can dynamically stretch warm and cold transactional data from SQL Server 2016 to Azure. Unlike cold data storage, your data is always available. Stretch Database enables you to maintain longer data retention timelines without overspending. Choose a level based on how often you’ll access the data, then scale up or down as needed. Using Stretch Database doesn’t require any application changes, and you can use Always Encrypted with Stretch Database to extend data more securely.
For more information, please visit the SQL Server Stretch Database
page, and for more information about pricing, please visit the SQL Server Stretch Database Pricing