# Replication & Disaster Recovery

You have root-level control of the cluster, so you replicate data for disaster recovery between ZCS clusters and any other Ceph cluster you administer.

## Replication options

- Object (RGW multisite). Replicate buckets and objects between zones or clusters for an active-active or active-passive object store.
- Block (RBD mirroring). Asynchronously mirror RBD images to a second cluster for block-level DR.

## Common topologies

- Replicate in to ZCS. Point an existing on-prem or third-party Ceph cluster at your ZCS cluster to use it as a recovery target.
- Replicate out from ZCS. Replicate your ZCS cluster to another ZSoftly region, to an on-prem cluster, or to any Ceph cluster you operate.

Both endpoints are standard Ceph, so replication is not tied to ZSoftly. You pair a ZCS cluster with clusters you run anywhere.

| Resource | URL |
| --- | --- |
| RGW Multisite | [https://docs.ceph.com/en/latest/radosgw/multisite/](https://docs.ceph.com/en/latest/radosgw/multisite/) |
| RBD Mirroring | [https://docs.ceph.com/en/latest/rbd/rbd-mirroring/](https://docs.ceph.com/en/latest/rbd/rbd-mirroring/) |

Review DR designs with ZSoftly support: which pools, sync direction, and recovery objectives. That way the topology matches your recovery targets.