While reviewing backup logs I noticed that my system drive backup size had increased by nearly 14G.  I found a hybernate file of 13.8G.
 
Hybernation was apparently enabled during the windows update process a few days ago.
 
There is no way to control via setup GUIs.  Hybernation is disabled by entering 'powercfg.exe -h off' from an elevated command prompt.  The same command with 'on' in place of 'off' enables hybernation.
 
I haven't found any other settings that were changed.  I'll update this post if I find any.

Hi Bob,
 
Make sure to disable Fast Start.
By default, Win10 uses a Hybernate file to boot faster.
If you're using a SSD, it'll boot fast regardless. 

Thanks Jim.  No Fast Start here.  This hybernate file was brand spankin new.  As soon as I ran the above command it disappeared.  Just another thing to check after updates I guess.
 
And yes, I did go SSD a while back.  One for "C" and one for "Samples".  SSD is a beautiful thing. 
 
 
 

so, does running with w10 pro provide some control over these annoying programming decisions, 
or no?
 

I am running Win10 Pro ...
 
 

Win10 Pro has the Group Policy Editor.
You can use that to shut down Cortana, One-Drive, etc.
 
In the case of "Turn On Fast Startup", that's in Control Panel>Power Options.
BTW, Windows updates can/do re-enable this option.

Win 10 Pro will let you easily postpone feature updates until you are ready.
 
But that doesn't change the fact that Microsoft upgrades can muck with your settings when a new release is installed.  A feature update is really like a Windows upgrade when you jump versions from 1507 > 1511 > 1607 (Anniversary) > 1703 (Creators) > 1709 (Fall Creators), etc.

Jim Roseberry
BTW, Windows updates can/do re-enable this option.

Yes, that was the point of my post.  To let folks know to check things carefully after updates.
 
 

Mine did not change after the update.  Fast start (or whatever its called) is still off.

I can't even find "Fast Start"
 
I type the work "Fast" in either Control Panel or Settings and nothing is found...
 
Sat here scratching my head...
 
W10 Pro