infromation from PR2100

Hello
I bought WD MyCloud PR2100 with 2 storage. I set NAS to Raid 1.
All information (on OS5) get me a message that device works properly and the condition hard drives are good.
but I cannot find a solution to check a copy on the second drive.
I cant find a place to set a time for a copy.
Is there a way to get into the second drive or just believe to these informations?
Thank you for your answers.