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Backup failed! USB Copy_ mirror backup failed: backup file or folder failed: create file failed: open /Volume1/@usb/usbshare1/Data-02/02 Media/Books/Toyota Hilux Surf/Audio Amplifiers & Speakers/4 Inch Speakers/75 watts RMS/100 W RMS/Kicker 40CS654 Speaker Testing.mp4: too many open files
So, I locate the file within the folder containing many (small) files and archive the folder as a .7z, then delete the offending folder. I restart USB Copy which happily proceeds further along until again it encounters another folder containing many small files and halts, giving the same error: too many open files.
Note: When I first tried USB Copy I was able to back up this same data in reverse without issue i.e., From D2-310 to F4-423.
Out of desperation, I ordered a 16GB DDR stick. Unfortunately, 16GB will most likely do nothing to resolve the situation, it's only utilising around 20% of my current 4GB anyhow.