wrote:
Any clue how it got unsynced?

wrote:
*+- Figured out it is "Properties"
*+-
*+- and why did I get (and prevent) duplication?

I could probably answer the question, if standing in
front of the computer. I don't know sitting here,
what you've done to it :-)

Synchronization is a great concept, *except* when
you manage to somehow, write old material over newer
material. Never underestimate the ability for a
computer to do things like that. Make *backups*
of your materials at regular intervals. For example
Macrium ReflectFree is one free program for backing
up whole C: partitions. I do backups here, to protect
against disk failures, and store the backup on
an external (large) rotating hard drive.

https://www.macrium.com/reflectfree

(Scroll half-way down the page, click the blue Home User
button on the left-hand side of the webpage)

There are more than 20 companies that make backup programs,
and several of them offer "free" editions with basic
full-backup capability. Something like Acronis backup,
the interface on it is easier to understand than Macrium,
so that's a paid-software option if you're not familiar
or comfortable with backup software. The interface
on Macrium does not bother me.

Paul