Thank you. I was figuring that would be the case, and thankfully it isn't my data, but someone elses But I don't think they'll care too much if it is considered "destroyed". I've proven I can use photorec to recover quite a bit of data, but you lose a lot (the file name, the organization, etc). So I've given my friend the two options I see. 1) buy the new drive, put it in, and lose all data telling the system to reformat. 2) buy 4 new drives, put them in, format them into the setup he wants, and continue the long painful process of using photorec and the even longer process of opening every file and renaming it.
The way I've handled my personal NASes is I set them up RAID0 (as they are 2 drive NASes) and I buy two of them then mirror the first one to the second. When a hardware failure occurs, the task to mirror the devices won't run. So I can then point all connections to the backup NAS (which becomes the primary NAS now). I then repair the first one and have it the mirror destination now once repaired.
Of course, all data I put on either NAS is also backed up, so if data corruption would occur and propagate, I can restore without any issues. Thanks for the help guys, it really has been beneficial