Geo-Replication in Kafka is a process by which you can duplicate messages in one cluster across other data centers or cloud regions. 

Geo-replication involves copying all the files and allows them to be stored across the globe if required. 

In Kafka, Geo-replication can be achieved by using Kafka’s MirrorMaker Tool. Geo-replication is a way to ensure that the data is backed up.

https://developer.confluent.io/learn-kafka/architecture/geo-replication/