#1 Global Leader in Data Resilience

Exchange backup fails at "TeamsMessagesData" folder

KB ID: 4256
Product: Veeam Backup for Microsoft 365
Published: 2021-12-14
Last Modified: 2022-07-08
mailbox
Get weekly article updates
By subscribing, you are agreeing to have your personal information managed in accordance with the terms of Veeam's Privacy Notice.

Cheers for trusting us with the spot in your mailbox!

Now you’re less likely to miss what’s been brewing in our knowledge base with this weekly digest

error icon

Oops! Something went wrong.

Please, try again later.

Challenge

Backup of an Exchange mailbox fails with the error:
Failed to synchronize item changes in folder: TeamsMessagesData

Solution

A stop-gap workaround for this error has been included with Veeam Backup for Microsoft 365 5d cumulative patch KB4235. This fix will cause the 'TeamsMessagesData' folder to be skipped if it fails to backup. When this skip occurs, a warning will be displayed in the job to notify the backup admin that data backup was skipped. Skipped data is excluded from backup and will not be restorable. All other mailbox data will still be backed up properly and restorable.

Possible long-term changes for the future are currently being researched. As new information becomes available, this KB article will be updated.

 

Update 2022-07-01:

Due to Microsoft's planned deprecation of Exchange Web Services (EWS) backup for the TeamsMessagesData folder, which was used in previous versions of Veeam Backup for Microsoft 365, starting with Veeam Backup for Microsoft 365 6a, the backup of Microsoft Teams data will now be performed using Microsoft Graph Export API for Teams to backup public channel messages noteUser chats will continue to be protected using the old method, until EWS backup of the TeamsMessagesData folder is fully deprecated by Microsoft.. However, to access these APIs, end-users must fill out a form with Microsoft to request access. Review KB4322 for more details.

To submit feedback regarding this article, please click this link: Send Article Feedback
To report a typo on this page, highlight the typo with your mouse and press CTRL + Enter.

Spelling error in text

This site is protected by hCaptcha and its Privacy Policy and Terms of Service apply except as noted in our Privacy Policy.
Thank you!

Thank you!

Your feedback has been received and will be reviewed.

Oops! Something went wrong.

Please, try again later.

You have selected too large block!

Please try select less.

KB Feedback/Suggestion

This form is only for KB Feedback/Suggestions, if you need help with the software open a support case

By submitting, you are agreeing to have your personal information managed in accordance with the terms of Veeam's Privacy Notice.
This site is protected by hCaptcha and its Privacy Policy and Terms of Service apply except as noted in our Privacy Policy.
Verify your email to continue your product download
We've sent a verification code to:
  • Incorrect verification code. Please try again.
An email with a verification code was just sent to
Didn't receive the code? Click to resend in sec
Didn't receive the code? Click to resend
Thank you!

Thank you!

Your feedback has been received and will be reviewed.

error icon

Oops! Something went wrong.

Please, try again later.