MyBook RAID 1 2x4Tb crashed and got broken

MyBook RAID 1 2x4Tb crashed and got broken. I don’t know what happened. May have been software or hardware related. Who knows.

It held one full season (last years’s) of our WebTV production. Luckily, I recovered those precious files using a utility program called EaseUS Data Recovery Wizard.

I thought that mirroring my datas would have saved me from catastrophes. Hum!

Now, what should I do? Reformat the two drives and get the datas back in? Or send it to WD for inspection prior to anything else?

How would you back up a full season of WebTV productions?

Thank you for your help.