Mission critical apps need a database that's always on. While intra-cluster replication helps with server failures, giving you high availability, your system still remains at risk from catastrophic failures. You may also need a way to improve the response time for users when they're globally distributed.
Cross datacenter replication (XDCR) provides an easy way to replicate data between clusters for disaster recovery, geo-locality and test, development, and export.
In the white paper Developing Applications with XDCR, you’ll learn: