I am running a mac pro with all 4 Hard Drive bays in use. I have my system drive, and then two other hard drives that store project information for recording. My 4th drive is my back up drive. Does Time machine back up all 3 of my drives? I know that it is designed to recover my system drive. But let's say that one of my project drives dies, what would the process be like to restore information back onto a new replacement project drive?