The backup of organizations under M365 business plans alone are supported as they are part of an exchange environment and have exchange licenses. Hence, the data under "Emails, Contact, Calendar & Task" are backed up. Additionally, if any users in an organization have a OneDrive license, then OneDrive Data is also backed up. Once the Global Admin of an M365 business plan tenant authenticates, then the backup of the tenant data (SharePoint, Groups & Teams) is also created.
Can I back up M365 home plan accounts?