There are a lot of tools in the open-source space that allow you to handle most of your backup, recovery, replication, and disaster recovery needs. There are also some other enterprise hardware and software options.
Replication and mirroring with Apache Falcon.
Dual ingest or replication via HDF.
In-memory WAN replication via memory grids (Gemfire, GridGain, Redis, etc.).
Apache Storm, Spark, and Flink custom jobs to keep clusters in sync.