Enable Teams Graph API Backup on Veeam Backup for Microsoft 365 Server

On the Veeam Backup for Microsoft 365 server, in an Administrative PowerShell window, run the following PowerShell command:
^{Alternatively, right-click the Veeam Backup for Microsoft 365 PowerShell shortcut on the desktop and select Run as Administrator.}

Enable Teams Graph API Backup on Proxies

Note: Enabling Teams Graph API Backup for a proxy is irreversible. Once a proxy has been configured to use the Microsoft Graph Export API for Teams, it cannot be reverted to use EWS.

On the Veeam Backup for Microsoft 365 server, in an Administrative PowerShell window*, perform the following steps to enable usage of the Graph Export API for Teams on each of the Proxies that will use the new API to back up Teams chatsVeeam Backup for Microsoft 365 backs up Teams channel messages. For more information on the limitations of Teams chat backup, click here..
^{*Alternatively, right-click the Veeam Backup for Microsoft 365 PowerShell shortcut on the desktop and select Run as Administrator.}

1. Run the following PowerShell Command to retrieve a list of all available Proxies and their Proxy IDs.
   You will need the proxy IDs for the next step.

2. For each backup proxy that you want to process Team data via the new Teams Export APIs, run the following PowerShell cmdlet:​
   Replacing proxy_id with the GUID of the proxy.

Enable Teams Chat Backup in GUI

1. Reopen the Veeam Backup for Microsoft 365 console.
2. Right-click on the Organization and select 'Edit organization'.
   
   Note that there is now a checkbox specifically for Microsoft Teams. That checkbox needs to be selected to back up Teams chatsVeeam Backup for Microsoft 365 backs up Teams channel messages. For more information on the limitations of Teams chat backup, click here.. If access to the API has not been granted and this checkbox is enabled, the Teams backup will fail.