I was recently helping a customer of mine rationalise their file collection; they had 9 external hard drives with connectivity ranging from FireWire 400 up to USB 3, and many, many duplicates from over the years of manually backing up and a number of failed consolidation attempts. I used “Carbon Copy Cloner” to copy all of the contents on to a large drive, then used an Application called “Hyperspace” that makes clever use of an APFS feature to enable eliminating the extra capacity used by duplicates without actually deleting them - they all transparently point back to the first copy. It ended up saving over 1.8TB, which was a huge help in slimming down the space needed!

Currently listening: Ninajirachi - “iPod Touch”