I know the feel, I have been screwed similarly back in the day by OS X. I was moving college project

I know the feel, I have been screwed similarly back in the day by OS X. I was moving college project files to an external drive and apparent for just a split second the USB drive lost connection for a bit, which under normal circumstances wouldn't be that big a deal, but then there's Apple. See, when you are doing a move files option if by any chance the destination becomes unavailable it reverts the move but then also deletes the files in the source, so you're left with nothing. Almost failed my grade, luckily I could hand in the files later.
https://www.cnet.com/tech/computing/os-x-lion-finder-bug-deletes-moved-files/
CNET
It's an unusual bug, but it could still happen to you. Here's how to dodge it.
OS X Lion Finder bug deletes moved files
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