You can exclude an item from a Teams app. Excluding an item does not remove the item from the app, but the item is not backed up.
Procedure
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From the navigation pane, go to Protect > Office 365.
The Office 365 Overview page appears.
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On the Apps tab, click the app.
The Overview page of the app appears.
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On the Teams tab, in the row for the item that you want to remove, click the action button , and then select Manage > Exclude from backup.
A confirmation dialog box appears.
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Click Yes.
What to Do Next
To see items that were removed, on the Content tab, click the gear button , and then select Clear all filters. After you clear the filters, in the table column heading, click the Column Settings button , and then click Column > Status. The status column is added to the table, and displays Active, Deleted, Do not Backup and Unprotected status for the item.