Add the teams that you want to back up to the Teams app.
From the navigation pane, go to Protect > Applications > Office 365.
The Office 365 apps page appears.
In the Name column, click the app.
The app page appears.
On the Teams tab, click Add, and then select Teams.
The Add team dialog box appears.
From the Office 365 plan list, select the plan to use for the teams.
From the Teams list, select the teams to add.