Azure Blob Storage is Microsoft's massively scalable cloud object store. Blob Storage is ideal for storing any unstructured data such as images, documents and other file types. Read this Introduction to object storage in Azure to learn more about how it can be used in a wide variety of scenarios.
The data in Azure Blob Storage is always replicated to ensure durability and high availability. Azure Storage replication copies your data so that it is protected from planned and unplanned events ranging from transient hardware failures, network or power outages, massive natural disasters, and so on. You can choose to replicate your data within the same data center, across zonal data centers within the same region, and even across regions. Find more details on storage replication.
Read about it in the Azure blog.