To automatically discover and back up all teams, add All Teams to the Teams app.
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 Content tab, at the upper-right area of the page, click Add.
The Configure Content page appears.
Select Add content to backup, and then click Next.
The Add Content tool appears.
From the Select Teams or Chats for backup list, select Teams,
Under Standard, select All teams, and then click Next.
The Content tab appears.
All teams that are discovered will be added to the content. That process might take some time, depending on the size of the content. When the discovery job is complete, the Office 365 Plan tab appears.
From the Office 365 plan list, select the plan to use for backing up the teams, and then click Next.
The Summary tab appears.