micky wrote:

Most backup software keeps only one generation of backup. But for
reasons explained ealier, for some folders, I'd like to keep more than
one generat4ion. Today's backup, yesterday's, the day before's. Any
recommendations?

The Microsoft games on Windows 10 have always been adware. They ads
don't show up for awhile, but they do show up.

It would be difficult other than authors with deep pockets to provide
apps for Windows 10 or for Android that are not only free to use but
also ad-free. It costs money to put an app in their Stores.

Google Play Sto $25 per year
Microsoft Sto $49 to $99 per year

The development tools are free, but authors need to compensate for their
costs to publish their apps at these app stores. Plus both Microsoft
and Google get a bite of the action: developers only get 70% of a
transaction (Microsoft ups that to 80% after $25K in sales). They
aren't your parents that subsidize all your wants. Why should they be
penalized for their effort, but not you? They're hoping for volume
sales, by getting you to suffer a nip in a small price but nipping lots
of buyers.

The Stores are not download sites where authors can host their wares for
free. Those Stores cost money to publish any apps over there. However,
I have seen some sudoku apps at the Google Play store claim they are
free AND ad-free. They're ad-sponsored over at the Microsoft store,
probably because the cost to the author to publish is far more expensive
at the Microsoft Store. They probably hope you will will upgrade from
their crippled lureware to their full-featured payware version.

Stop looking for sudoku apps at the Microsoft or Google stores. Authors
have to pay up-front costs there to publish there, and it's not their
responsibility to cater to freeloaders and act 100% altruistically to
eliminate you paying for their effort and compensate for their costs.
Are YOU going to provide an app store where you pay all the hosting
costs, bandwidth, and manpower to curate the content, so all visitors to
your site can get free and ad-free software? How deep are your pockets?

Don't look to the Microsoft or Google stores to find ad-free freeware.
Instead of looking for UWP (Universal Windows Platform) WinRT apps to
use under Windows 10, hunt the download sites for Win32 API freeware
that is also ad-free. Even then, there aren't that many freewares that
are completely ad-free. In a search, one I found is:

https://sourceforge.net/projects/winsudoku/

However, I've not played it to know that it is both free and ad-free.
As I recall, and in contrast to the GitHub repository, any software on
Sourceforge is supposed to be free and ad-free (and open source). While
their site has banner ads, I thought any projects hosted there had to be
ad-free. As a consequence, many projects come and go or get abandoned
because the author loses interest, dies, gets busy with life or other
projects, or otherwise decides not to continue developing or supporting
their Sourceforge project. Alas, Sourceforge doesn't seem to require an
author "touch" their project to keep it updated every few months to
ensure the author is still there and monitoring their project, so there
are plenty of dead projects at Sourceforge. Case in point: the above
sudoku game project has not been updated since 2014, a good indication
the project got abandoned. However, old doesn't mean unusable, so it
might still run as a Win32 program today. The authors have no financial
incentive to continue the project, because it's hosted for free so the
authors have no motivation to keep alive a project.