Carbon Copy Cloner is an excellent program if you want to backup something on an external drive to another external drive, at least for me. I put all my pictures on an external hard drive, and then have Carbon Copy Cloner, scheduled to copy the folder to the other drive. It only copies stuff that is different too. You could probably use time machine, but it’s easier this way for me. I actually have it set to copy everything on my data partition on one of my external drives to my ioSafe.
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