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<h1 id="backup-on-object-stores">Backup on object stores</h1>
<!-- SPDX-License-Identifier: CC-BY-4.0 -->
<p>CloudNativePG natively supports <strong>online/hot backup</strong> of PostgreSQL
clusters through continuous physical backup and WAL archiving on an object
store. This means that the database is always up (no downtime required)
and that Point In Time Recovery is available.</p>
<p>The operator can orchestrate a continuous backup infrastructure
that is based on the <a href="https://pgbarman.org">Barman Cloud</a> tool. Instead
of using the classical architecture with a Barman server, which
backs up many PostgreSQL instances, the operator relies on the
<code>barman-cloud-wal-archive</code>, <code>barman-cloud-check-wal-archive</code>,
<code>barman-cloud-backup</code>, <code>barman-cloud-backup-list</code>, and
<code>barman-cloud-backup-delete</code> tools. As a result, base backups will
be <em>tarballs</em>. Both base backups and WAL files can be compressed
and encrypted.</p>
<p>For this, it is required to use an image with <code>barman-cli-cloud</code> included.
You can use the image <code>ghcr.io/cloudnative-pg/postgresql</code> for this scope,
as it is composed of a community PostgreSQL image and the latest
<code>barman-cli-cloud</code> package.</p>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>Always ensure that you are running the latest version of the operands
in your system to take advantage of the improvements introduced in
Barman cloud (as well as improve the security aspects of your cluster).</p>
</div>
<p>A backup is performed from a primary or a designated primary instance in a
<code>Cluster</code> (please refer to
<a href="../replica_cluster/">replica clusters</a>
for more information about designated primary instances), or alternatively
on a <a href="../backup/#backup-from-a-standby">standby</a>.</p>
<h2 id="common-object-stores">Common object stores</h2>
<p>If you are looking for a specific object store such as
<a href="../appendixes/object_stores/#aws-s3">AWS S3</a>,
<a href="../appendixes/object_stores/#azure-blob-storage">Microsoft Azure Blob Storage</a>,
<a href="../appendixes/object_stores/#google-cloud-storage">Google Cloud Storage</a>, or
<a href="../appendixes/object_stores/#minio-gateway">MinIO Gateway</a>, or a compatible
provider, please refer to <a href="../appendixes/object_stores/">Appendix A - Common object stores</a>.</p>
<h2 id="retention-policies">Retention policies</h2>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>Retention policies are not currently available on volume snapshots.</p>
</div>
<p>CloudNativePG can manage the automated deletion of backup files from
the backup object store, using <strong>retention policies</strong> based on the recovery
window.</p>
<p>Internally, the retention policy feature uses <code>barman-cloud-backup-delete</code>
with <code>--retention-policy “RECOVERY WINDOW OF {{ retention policy value }} {{ retention policy unit }}”</code>.</p>
<p>For example, you can define your backups with a retention policy of 30 days as
follows:</p>
<pre><code class="language-yaml">apiVersion: postgresql.cnpg.io/v1
kind: Cluster
[...]
spec:
backup:
barmanObjectStore:
destinationPath: "<destination path here>"
s3Credentials:
accessKeyId:
name: aws-creds
key: ACCESS_KEY_ID
secretAccessKey:
name: aws-creds
key: ACCESS_SECRET_KEY
retentionPolicy: "30d"
</code></pre>
<div class="admonition note">
<p class="admonition-title">There's more ...</p>
<p>The <strong>recovery window retention policy</strong> is focused on the concept of
<em>Point of Recoverability</em> (<code>PoR</code>), a moving point in time determined by
<code>current time - recovery window</code>. The <em>first valid backup</em> is the first
available backup before <code>PoR</code> (in reverse chronological order).
CloudNativePG must ensure that we can recover the cluster at
any point in time between <code>PoR</code> and the latest successfully archived WAL
file, starting from the first valid backup. Base backups that are older
than the first valid backup will be marked as <em>obsolete</em> and permanently
removed after the next backup is completed.</p>
</div>
<h2 id="compression-algorithms">Compression algorithms</h2>
<p>CloudNativePG by default archives backups and WAL files in an
uncompressed fashion. However, it also supports the following compression
algorithms via <code>barman-cloud-backup</code> (for backups) and
<code>barman-cloud-wal-archive</code> (for WAL files):</p>
<ul>
<li>bzip2</li>
<li>gzip</li>
<li>lz4</li>
<li>snappy</li>
<li>xz</li>
<li>zstd</li>
</ul>
<p>The compression settings for backups and WALs are independent. See the
<a href="https://pkg.go.dev/github.com/cloudnative-pg/barman-cloud/pkg/api#DataBackupConfiguration">DataBackupConfiguration</a> and
<a href="https://pkg.go.dev/github.com/cloudnative-pg/barman-cloud/pkg/api#WalBackupConfiguration">WALBackupConfiguration</a> sections in
the barman-cloud API reference.</p>
<p>It is important to note that archival time, restore time, and size change
between the algorithms, so the compression algorithm should be chosen according
to your use case.</p>
<p>The Barman team has performed an evaluation of the performance of the supported
algorithms for Barman Cloud. The following table summarizes a scenario where a
backup is taken on a local MinIO deployment. The Barman GitHub project includes
a <a href="https://github.com/EnterpriseDB/barman/issues/344#issuecomment-992547396">deeper analysis</a>.</p>
<table>
<thead>
<tr>
<th>Compression</th>
<th>Backup Time (ms)</th>
<th>Restore Time (ms)</th>
<th>Uncompressed size (MB)</th>
<th>Compressed size (MB)</th>
<th>Approx ratio</th>
</tr>
</thead>
<tbody>
<tr>
<td>None</td>
<td>10927</td>
<td>7553</td>
<td>395</td>
<td>395</td>
<td>1:1</td>
</tr>
<tr>
<td>bzip2</td>
<td>25404</td>
<td>13886</td>
<td>395</td>
<td>67</td>
<td>5.9:1</td>
</tr>
<tr>
<td>gzip</td>
<td>116281</td>
<td>3077</td>
<td>395</td>
<td>91</td>
<td>4.3:1</td>
</tr>
<tr>
<td>snappy</td>
<td>8134</td>
<td>8341</td>
<td>395</td>
<td>166</td>
<td>2.4:1</td>
</tr>
</tbody>
</table>
<h2 id="tagging-of-backup-objects">Tagging of backup objects</h2>
<p>Barman 2.18 introduces support for tagging backup resources when saving them in
object stores via <code>barman-cloud-backup</code> and <code>barman-cloud-wal-archive</code>. As a
result, if your PostgreSQL container image includes Barman with version 2.18 or
higher, CloudNativePG enables you to specify tags as key-value pairs
for backup objects, namely base backups, WAL files and history files.</p>
<p>You can use two properties in the <code>.spec.backup.barmanObjectStore</code> definition:</p>
<ul>
<li><code>tags</code>: key-value pair tags to be added to backup objects and archived WAL
file in the backup object store</li>
<li><code>historyTags</code>: key-value pair tags to be added to archived history files in
the backup object store</li>
</ul>
<p>The excerpt of a YAML manifest below provides an example of usage of this
feature:</p>
<pre><code class="language-yaml">apiVersion: postgresql.cnpg.io/v1
kind: Cluster
[...]
spec:
backup:
barmanObjectStore:
[...]
tags:
backupRetentionPolicy: "expire"
historyTags:
backupRetentionPolicy: "keep"
</code></pre>
<h2 id="extra-options-for-the-backup-and-wal-commands">Extra options for the backup and WAL commands</h2>
<p>You can append additional options to the <code>barman-cloud-backup</code> and <code>barman-cloud-wal-archive</code> commands by using
the <code>additionalCommandArgs</code> property in the
<code>.spec.backup.barmanObjectStore.data</code> and <code>.spec.backup.barmanObjectStore.wal</code> sections respectively.
This properties are lists of strings that will be appended to the
<code>barman-cloud-backup</code> and <code>barman-cloud-wal-archive</code> commands.</p>
<p>For example, you can use the <code>--read-timeout=60</code> to customize the connection
reading timeout.</p>
<p>For additional options supported by <code>barman-cloud-backup</code> and <code>barman-cloud-wal-archive</code> commands you can refer to the
official barman documentation <a href="https://www.pgbarman.org/documentation/">here</a>.</p>
<p>If an option provided in <code>additionalCommandArgs</code> is already present in the
declared options in its section (<code>.spec.backup.barmanObjectStore.data</code> or <code>.spec.backup.barmanObjectStore.wal</code>), the extra option will be
ignored.</p>
<p>The following is an example of how to use this property:</p>
<p>For backups:</p>
<pre><code class="language-yaml">apiVersion: postgresql.cnpg.io/v1
kind: Cluster
[...]
spec:
backup:
barmanObjectStore:
[...]
data:
additionalCommandArgs:
- "--min-chunk-size=5MB"
- "--read-timeout=60"
</code></pre>
<p>For WAL files:</p>
<pre><code class="language-yaml">apiVersion: postgresql.cnpg.io/v1
kind: Cluster
[...]
spec:
backup:
barmanObjectStore:
[...]
wal:
additionalCommandArgs:
- "--max-concurrency=1"
- "--read-timeout=60"
</code></pre>
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