---
title: Microsoft Entra ID's backup authentication system
description: Increasing the resilience of the authentication plane with the backup authentication system.
ms.service: entra
ms.subservice: architecture
ms.topic: conceptual
ms.date: 05/29/2024
ms.author: joflore
author: MicrosoftGuyJFlo
manager: femila
ms.reviewer: joroja
---
# Microsoft Entra ID's backup authentication system
- Software as a service (SaaS) applications available in the app gallery, like ADP, Atlassian, AWS, GoToMeeting, Kronos, Marketo, SAP, Trello, Workday, and more.
- Selected line of business applications, based on their authentication patterns.
Service to service authentication that relies on managed identities for Azure resources or are built on Azure services, like virtual machines, cloud storage, Azure AI services, and App Service, receives increased resilience from the backup authentication system.
---
title: Backup Authentication System for Microsoft Entra ID
description: Explore the resilience features of Microsoft Entra ID's backup authentication system, designed to maintain authentication availability for users and services.
ms.service: entra
ms.subservice: architecture
ms.topic: conceptual
ms.date: 07/22/2025
ms.author: joflore
author: MicrosoftGuyJFlo
manager: femila
ms.reviewer: joroja
ms.custom:
- ai-gen-docs-bap
- ai-gen-title
- ai-seo-date:07/22/2025
- ai-gen-description
---
# Microsoft Entra ID's backup authentication system
- Software as a service (SaaS) applications available in the app gallery, like ADP, Atlassian, AWS, GoToMeeting, Kronos, Marketo, SAP, Trello, Workday, and more.