You can remove an item from a Teams app. Removing an item will not delete any data that has been backed up for this team. The removed team will not be displayed under the Teams tab, and data will not be backed up for this team unless it is included again.
However, the next autodiscovery will add the team back to the Teams app.
From the navigation pane, go to Protect > Office 365.
The Office 365 apps page appears.
In the Name column, click the team that contains the item that you want to remove.
On the Teams tab, in the row for the team that you want to remove the item from, click the action button , and then select Manage > Remove from content.
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.