Correct me if I am wrong as I'm learning but wouldn't you have an internal drive locked down during a ransomware attack? I understand the idea of having it for a back to up and being internal for speed. It definitely is better than no back up. We have a 4 disc raid (not sure which version) but can lose two drives and still be good to go.

How likely is it that a hacker would look for, find and lock down a NAS. I understand the answer is "that depends..." But I'm having the conversation to learn but also for others.