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Interactive web applications need a database that is always on (24x365), period. While replication within a database cluster helps with single server failures giving you high availability, your system still remains at risk from catastrophic failures – loss of power, natural disaster, etc. You also need a way to improve the response time for users when they are globally distributed.
Couchbase Server 2.0 supports cross datacenter replication (XDCR), providing an easy way to replicate data from one cluster to another for disaster recovery as well as better data locality (getting data closer to its users).