Data missing in O365 backup - Solution is in-place but not documented and communicated
When a Teams chat is started it automatically creates a Exchange group mailbox, an OneDrive account for that same group mailbox and a SharePoint site for that Teams chat. All conversations are put in the Exchange group mailbox and up until October 2020 they could be found under the folder Conversation History\Team Chat. Now here comes the fun part, starting October Microsoft changed something in how they save the chats and they moved the chats to a new folder named ~TeamsMessagesData.During the roll-out of a M365 customer we encountered that the teams chats were not being backupped past September 2020 and as I could not find any issue with the back-up nor any configuration issues we opened a case with Commvault to research the issue. Big was our surprise as in the first reaction from the Commvault engineer I received the answer to my question, namely a hidden additional setting which would enabled the back-up of the new Teams chat folder, being:IncludeTeamsMessagesData