Update upgrade-from-21-10.md

centreon · Dec 17, 2024 · 3c23fc7 · 3c23fc7
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diff --git a/versioned_docs/version-25.10/upgrade/upgrade-from-21-10.md b/versioned_docs/version-25.10/upgrade/upgrade-from-21-10.md
@@ -25,6 +25,8 @@ servers:
 - Central server
 - Database server
 
+If you use Open Ticket providers with custom configurations, [make a backup of these before updating Centreon](../alerts-notifications/ticketing-install.md#creating-a-backup-of-your-custom-open-ticket-provider-configurations).
+
 ## Upgrade the Centreon Central server
 
 > When you run a command, check its output. If you get an error message, stop the procedure and fix the issue.