IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
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Elastic Docs ›Elasticsearch Guide [7.4] ›Set up a cluster for high availability

Back up a cluster

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Back up a cluster

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You cannot back up an Elasticsearch cluster by simply taking a copy of the data directories of all of its nodes. Elasticsearch may be making changes to the contents of its data directories while it is running; copying its data directories cannot be expected to capture a consistent picture of their contents. If you try to restore a cluster from such a backup, it may fail and report corruption and/or missing files. Alternatively, it may appear to have succeeded though it silently lost some of its data. The only reliable way to back up a cluster is by using the snapshot and restore functionality.

To have a complete backup for your cluster:

  1. Back up the data
  2. Back up the cluster configuration
  3. Back up the security configuration

To restore your cluster from a backup:

  1. Restore the data
  2. Restore the security configuration
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