All folders and files in MyBookLiveDuo disappeared overnight

All folders and files in my MyBookLiveDuo disappeared overnight. From the dashboard, it shows that 621gb is being used. However under “Shares”, all of the folders shows 0mb with the exception of the Public folder which shows 675mb (i supposed it contains all the setup files etc).

From file explorer, none of the folders can be seen except for the Public folder.

Hope someone can help with this. Thanks.