We are excited to announce the public preview of Azure Zone Redundant Storage (ZRS). ZRS greatly simplifies development of highly available applications by storing three replicas of your data in different Availability Zones, with inserts and updates to data being performed synchronously across these Availability Zones. This enables you to continue to read and write data even if the data in one of the Availability Zones is unavailable or unrecoverable. ZRS is built over Availability Zones in Azure which provide resilience against failures through fault-isolated groups of datacenters within a single region.
Zone Redundant Storage should be considered for applications where regional availability is critical and downtime is not acceptable, and both read and write access are required at all times.
Read about it in the Azure blog.