In case you want to try to back up a thumb drive or other external the manual way by copying it to your main drive and then reapply it back to a formatted or another drive, forget about it.
If there are any subfolders that you’re trying to copy back over, you’ll get an error saying that the main folder is unable to be read or written. Basically you’ll have to go thru all the subfolders and bring the content out into a folder you create somewhere on the main drive and then restructure the destination drive with all new folders.
It sucks.
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