Super users for Enjay NAS can access this backup folders, the Backup folder is visible to all users but can be accessed only by super User.
Check the Super User in Enjay Nas.
Go to Accounts -> User management.
Super user indicated by "star" in Yellow color.
The folder name is "backup" when you access Nas share.
Go to Run and type \\ Nas ip
It will prompt Super user authentication.
Login with super user and his password.