I think that it is easy to see some benefits of separating BOOT and DATA into two partitions or drives; it makes for each backup.
However, I was always under the impression that it is better to separate your BOOT from your DATA drives to increase performance. For this reason, I had 4 drives, configured in two mirrors (BOOT & DATA).
Because drives are so large now, I'd prefer to take two terabyte drives, mirror them, and partition them into BOOT and DATA.
Am I losing any performance benefit here?