For further import sessions in Lightroom, you can choose the option "Make a Second Copy to: " under File handling panel and choose the location as your 2nd hard drive so that the second copy of your original images will be made on that drive.
However, for all the images imported previously, you will have to copy them manually to the 2nd drive using Finder.
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You want to use some third party automated mechanism to do this. I don't know if Time Machine can make backups to a 2nd disk, but there are products out there that can be simply programmed to back up to HD1 followed by backup to HD2.
Thank you, that's a good point. I remember that option now you have mentioned it. So I wonder if i drag and drop entire contents of HD 1 to HD 2 then use the "Make a second copy" option going forward. Would that work a-ok do you think?
Yes, that would be fine. Just make sure drag and drop should not work as cut and paste.
It should be copy and paste.
Thank you for your reply.
I had a look through some of the 3rd party apps like Carbon copy cloner but they all seem to talk about backing up the main drive of the mac.
Nothing seemed obvious from a google search thus far.
Certainly backup up all of your drives is a good idea; however many backup utilities allow you to select to backup just certain folders, perform the backup every day at 4am, etc. I cannot give you an example on Mac computers because I do not use Mac computers, but I know they exist.