Veeam Backup for Microsoft Office 365 and “Failed to synchronize item changes. The server cannot service this request right now. Try again later.” error.

Recently I’ve been struggling with a few issues on Veeam Backup for Microsoft Office 365, still struggling with one, but fortunately can post an update about two that has been resolved. Jupi!

 

Okay, so I got this error going on on Veeam:

30.10.2017 07:21:17 :: Job started at 30.10.2017 08:21:17
30.10.2017 07:21:17 :: Connected to organization
30.10.2017 07:21:20 :: Found 1 mailboxes
30.10.2017 07:21:20 :: Processing mailbox <mailbox_name>@<domain_name.com> failed with error: Failed to synchronize item changes. The server cannot service this request right now. Try again later. :: 0:21:22
30.10.2017 07:42:43 :: Processing of all mailboxes failed
30.10.2017 07:42:43 :: Job failed at 30.10.2017 08:42:43

 

Backup of one single mailbox was constantly failing.

What appeared was mailbox was over 100GB in size When running Get-MailboxStatistics against it – do not know how it is possible though as O365 gives you 100GB for the mailbox.

After enabling archive for this mailbox and runnig Start-ManagedFolderAssistant so the main mailbox went down below 100GB – the backup went just fine ^^.

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