Once you have logged in to the portal click on the domain name to open the properties of the backup agent

On the Overview tab, you can check the account statistics for the services added to the domain.

You will also be able to add a service from the Overview tab if one has not yet been added

The History tab will provide you with a list of the backup and recovery sessions for this device, what data source they are for and the status of this backup session.

In the Errors tab, you will be given a list of errors that have occurred during previous backup and restore sessions. You can use this information to help troubleshoot any issues.

You can check the Audit tab to see which user account has been used to carry out actions on the domain. In here you will be able to see which user account created the domain, added or removed services, amended backup selections, started restores and deleted backup history.

On the Protected users tab, you can view a full list of all protected users and the services protected for these users.
This tab is read-only, but filtering is available on the right hand banner to select which services and types of users you wish to view.

When looking at the domains properties, select the Exchange, OneDrive or SharePoint tab to view all mailboxes, accounts or sites present in the domain. (You will only see the tabs that correspond to the services configured for the domain. For example, if you only have OneDrive configured, you will not see the Exchange or SharePoint tabs.)

In here, you can add new accounts or sites for backup by ticking the ones not currently backed up. You may look for the specific account using the search bar and filter the output using the left hand tool bar. You may also enable or disable 'Automatically add new accounts to backup/Automatically add new sites to backup' by toggling the on/off slider.