Can you make it so one hard drive would copy whatever is on the other hard drive, so they both would be exactly the same? (Both are 1 TB each)
More abouthard drives
I believe that's called RAID 1.
How do i use RAID 1?
If your motherboard supports it, the manual should have an explanation of how to enable it and set it up. Otherwise, you'll need a RAID expansion card or to use software RAID. Guides are easy to find, just search for "how to set up RAID 1".