While a highly available failover cluster like the one described in this document provides a layer of redundancy, it is still important to regularly take a traditional backup of the configuration and data, which would not be easy to recover from if lost or corrupted. The section Backing Up and Restoring Data
in the Sentinel Administration Guide describes how to use Sentinel's built-in tools for creating a backup. These tools should be used on the active node in the cluster because the passive node in the cluster will not have the required access to the shared storage device. Other commercially available backup tools could be used instead and may have different requirements on which node they can be used.