KB4075: Backup repository upgrade fails after upgrading to v5
www.veeam.com › kb4075Dec 03, 2020 · A local backup repository fails to upgrade after upgrading to Veeam Backup for Microsoft Office 365 5.0 version 5.0.0.1061. Cause In case when the Team Chat folder has been protected with the earlier version of Veeam Backup for Microsoft Office 365, a backup repository may contain items with several versions that have identical timestamps.