You are welcome.
(1) Regarding Windows system image backup...
(a) That's right, there is no option to create one on a flash drive. I haven't copied one there to see whether the restore process would then see it (for restore purposes) because I don't believe it belongs on one anyway.
The last thing the image making process does is to "create a shadow copy" onto the drive on which it is making the image. I'm not sure what that is, maybe it's an invisible partition containing a duplicate of the image or stuff important for it to function.
I think probably one cannot be made onto a flash drive.
(b) WindowsImageBackup has to go onto a network location (of which I know nothing) or onto an
external hard drive (HDD). The HDD need not be dedicate to it. A 2 TB HDD holds my 3 images plus other stuff easily with a ton of space left.
(c) I think because the shadow copy doesn't go with it, WindowsImageBackup is unreliable when moved from one drive to another.
WindowsImageBackup does get seen by the restore process on the second HDD (as long as it's still in a root folder), but things look funny in a dry run to restore it. My notes seem to say, C: didn't show
up as one of the partitions to restore or it was named oddly. It's possible, I guess, it would actually restore -- but I just don't quite trust it.
You can probably move it back to the original drive (that has the shadow copy) & expect it to work, but why move it away in the first place then.
(d) "So are you saying I should make another and put it root drive instead of trying to move it?
I really don't think one needs a duplicate of ones images. The older an image gets, the less one likely will want it. When 2004
comes in & I'm sure it works nicely, I'll certainly never restore 1909. I keep the last three made just in case the first two won't work. Also, it's good in case there is a problem to correct that goes that far back. Here's what I've currently got (as on page
11). When 2004 comes in, I'll delete/replace the top one. The other two will be replaced in time...

(e) That whole folder (3 full images) is only 94.1 GBs for me...

And it takes 15/so minutes for me to make an image. Have you deleted that first image you made yet? It contained 1809, 1909 & Win 8.1 to boot! But -- if you still get large ones & they take a long time to make -- maybe a 3rd-party image
maker is more appropriate for you. They are quicker & make more compact images. If you've got a Seagate or Maxtor HDD, their site will have an old but free version of Acronis True Image that will work (but you'll need a real mouse to use in Seagate's recovery
environment).
(2) Regarding Permissions...
(a) It is normal to have a Default & a Public user in the Users folder along with your user name. And, if you turn back on the Built-In Administrator, you'll get one for that too.
(b) I see you renamed your computer to "MyLatestAggrava". I hope it hasn't guessed the rest of that, but I do doubt it is the cause of Permissions problems.
(c) Lots of my Permissions look like the one in your picture. And what you say about them all not looking the same is true & as odd to me as it is to you.
(d) "You're probably right about the permission."
Ah, yes, my guess was right. I found another folder that gave that "click to get permanent permissions" message when I tried to open it (like each new image folder does). Until you click it, trying to copy/paste the folder gives the
other message...

But these are system folders we probably shouldn't be moving anyway.
(e) I asked Cortana twice to "Open Photos", & the second time was quicker. It took a second/two. The first time an app is opened it does more.
(f) I do hope that was indeed "just a little glitch" signing in after a hibernation. It hasn't happened to me, not that I can quite recall. Occasionally, I do get other glitches, such as Cortana becoming unresponsive or Edge crashing.
And I haven't even named my computer anything naughty.