wrote:
Figured out it is "Properties"

But how do I sync? (cut & paste)?

and why did I get (and prevent) duplication?

A few days ago, the USB plug for the Ext Drive was partially disconnected
with the drive dangling. But that wouldn't boot, so how would it have moved
files?

*+-I had moved my Docs to an external USB drive (years ago),
*+-now I am finding the dir dupl in both drives and not in sync.

*+-How can I sync and move to external?

*+-I totally forgot the command to move a MyDocs component to ext drive

SyncToy

https://en.wikipedia.org/wiki/SyncToy

https://www.microsoft.com/en-us/down....aspx?id=15155

Robocopy

https://en.wikipedia.org/wiki/Robocopy

https://docs.microsoft.com/en-us/pre...ectedfrom=MSDN

*******

Robocopy is power, as well as being dangerous.

It is a tool-of-choice for erasing disk content, by using the ?MIR
("Mirror") option. If you mirror an empty folder to a partition,
it will remove all the files on that partition.

When you first use Robocopy from the command line, do *not*
practice on your C: drive.

Make some separate partitions for practice on a hard drive.

Perhaps make a D: and E: using NTFS formatting.

Then you can test that D: testfolder gets copied to E:\testfolder

Create D:\testfolder and put some files in it. Then test like this

robocopy D:\testfolder E:\testfolder /mir

Verify that the folder on E contains the same files as D did.

Edit a file in the D testfolder, and save it, so that the
creation date is updated. Run the mirror command again.

robocopy D:\testfolder E:\testfolder /mir

Only the newly modified file in D: gets copied to E: , removing
the old copy on E: .

Be *very very careful* with Robocopy. *Do not* copy/paste
commands into the Command Prompt window containing robocopy
as the command. Sometimes, the mouse Copy operation you did,
fails to work, and the Paste buffer contains wrong information.
Pasting that can result in a deleted partition. You must be
*extra cautious* with this tool. I've only lost around, oh,
1GB of files because of this!

Any synchronization tool is dangerous. You have been warned.

*******

SyncToy has a GUI and does similar things.

*******

There are other tools, like XXCOPY but I've never used it for
any purpose here. That's before my generation.

Paul