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.
From the navigation pane, go to Protect > Office 365.
The Office 365 Overview page appears.
On the Apps tab, click the app.
The Overview page of the app appears.
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.
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.