Moving LR photos from iMac to external hard drive
I apologize in advance for what are probably basic questions. I've managed to fill my iMac hard drive with the photos in my Lightroom Classic Catalog. There are so many -- 19,000 + -- that I can no longer back up the poor, overstressed Mac. How do I transfer all those current photos onto an external hard drive in such a way that I can still pull them up in LR, with their metadata?
Once I've done that, what is the recommended workflow going forward? Is there a way to transfer photos from a camera's SD card through the computer and onto an external drive and then edit the photos on the computer using LR?
Finally, any recommendations for external hard drives? I'm on a 2017 iMac with 16GB of memory and 251 GB of flash storage. It's running Big Sur, though Apple is wanting me to upgrade to Monterey.
Many thanks.
BUT FIRST:
