Can't xcopy to USB-3 mounted disk [solved]

My Cloud OS 3 Personal & Network Attached Storage My Cloud
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It took a while to figure this one out, so I thought I’d post what I discovered. I found that I could xcopy a directory to the internal disk on My Cloud, but got access denied xcopying to an NTFS drive connected to the My Cloud USB-3 port. Robocopy gave a more useful error message - unable to set attributes for the directory. Robocopy can be told not to attempt to set attributes with the /copy:dt option; this is fine for what I’m doing. Is this a limitation of NTFS support in the My Cloud OS?

In case it matters, here’s my firmware version:
WDMyCloud v04.04.01-112 : Core F/W

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this is bound to the way of the NTFS file system handling within all kinds of Linux, yes.

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You can’t xcopy attributes to the NAS. In particular, you can’t xcopy the owner attributes, as the MyCloud is a different computer system, with different users.

So you can’t use the /O switch in xcopy.

I used an xcopy script to backup to the MyCloud for some time, but never to the USB. I recently switched to FreeFileSync, which does proper mirroring and syncing.

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Similar to some limitations using Robocopy, correct.