Azure maintains multiple copies of the data stored in it at different levels to ensure that the data is available and accessible all the time. Azure storage facilities have a number of data redundancy solutions that ensure data security and availability. Each solution is tailored to meet specific requirements of Azure customers such as the time to retrieve replicas and the importance of data being replicated. Locally Redundant Storage (LRS): To keep data highly available, Azure replicates data in multiple storage areas located in the same data center. As the copies of data are stored in three different places in the same physical location, it is also referred to as locally redundant storage (LRS). This is the most economical solution to ensure data redundancy.   Zone Redundant Storage (ZRS): Storage data is replicated to three different availability zones (AZs) of the primary zone. Data is copied to these three AZs to ensure that if the primary site becomes unavailable, data can be retrieved from the copies stored at these AZs. This data redundancy feature is called zone redundant storage because data is stored in different data centers of the same region.  Geographically Redundant Storage (GRS): Storage data is replicated to data centers located in different geographical regions. Azure provides this data redundancy option for the cases where the entire region becomes unavailable. Copies of data are stored in at least two distinct locations across different geographies. A geo-failover is required to access data from the secondary location in the case when the primary location is unavailable.  Read Access Geo Redundant Storage (RA-GRS): This data redundancy option ensures that the data stored in the secondary region can be accessed when the primary region is down.