Michael & Seth did an otherwise great video on this subject, but skimped a bit on how exactly one keeps external data storage devices coordinated. For example, I always keep copies of my images on a minimum of two hard drives. What is the best procedure to mirror, if I can use that term, the original HD with a new backup HD? Ideally, I'd like the two to appear identically in LR. Any thoughts or resources I might check?
Thanks,
Ron