Which data is protected in Teams?
Starting with Service Pack 22, you can use the Teams agent to protect and restore Microsoft Teams data. The Exchange agent protects the group mailbox created for Microsoft teams.
Emails, conversations, and calender items are protected.
Note
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Teams chat messages, which were previously stored under the TeamsMessagesData folder in the mailbox, are not backed up using the Exchange Online anymore because of changes made by Microsoft.
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Previously, team conversations were stored in the Office 365 Group Mailbox, in a hidden folder called Conversation History\Team Chat. Starting October 2020, they are stored in TeamsMessagesData.
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Previously,private chats were stored in the posting user's mailbox, in a hidden folder called Conversation History\Team Chat. Starting October 2020, they are stored in TeamsMessagesData.
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In-place and out of place restores to Office 365 Group Mailbox are not supported.
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Data can be restored to PST, disk, or out of place restore to user mailboxes or shared mailboxes.