Protect O365 groups that are base of Team from being deleted.
Currently O365 groups that are tied to team sites can be deleted and there is no notification of potential impact. If the group is tied to other services it should not allow the group to be deleted except via application (i.e. Team application)
Have you familiar with the groups soft delete & restore capabilities? https://support.office.com/en-us/article/Restore-a-deleted-Office-365-Group-b7c66b59-657a-4e1a-8aa0-8163b1f4eb54?ui=en-US&rs=en-US&ad=US