In Azure SQL Hyperscale, the default backup storage is geo-replication to a paired region. However, due to regulatory, compliance or other specific business requirements related to data residency control, this has been a problem for some applications. The new storage redundancy options solve this by providing options that customers can choose from aside from geo-redundancy. These are zone redundancy and local redundancy.
- Locally redundant storage (LRS): Your data is replicated three times within a single physical location. This protects against server rack and drive failures but will not help in the case of disasters like flooding or fire.
- Zone-redundant storage (ZRS): Your data is replicated across three Azure availability zones within the primary region. As they are three separate locations, this provides further protection for your backups.
- Geo-redundant storage (RA-GRS): Your data is replicated three times within the same location and also asynchronously to a separate location in a secondary region hundreds of miles away. Thus providing the highest level of protection for those not concerned by location.
You can find out more about Hyperscale backups and storage redundancy as well as how to configure these new options, here: Automatic, geo-redundant backups – Azure SQL Database & Azure SQL Managed Instance | Microsoft Docs
