Create Windows Backup in Windows 10 Backup & Restore

Bree said:

Both System Restore and System Image Backup use the same location for shadow storage, C:\System Volume Information. Just deleting a system image you no longer require can leave 'orphaned' data in there that configuring System Protection is unable to remove.

Both Delete System Image Restore Point from System Restore in Windows 10 and Manage Space for Windows Backup in Windows 10 are very informative, but nevertheless leaves some questions unanswered. I have many and hope you can bear with me.

1) Regarding Restore Points
So C:\System Volume Information contains normal Restore Points (automatic if Protection is turned on, or manual if user created). How much space is allocated for these Restore Points is adjusted using the Max Usage slider as per @Brink's article. But if Restore Points are always stored at C:\System Volume Information, what's the point of the sliders on D: and E: (external HDD)?


2) Regarding System Images
C:\System Volume Information furthermore also contains metadata pointing to System Images typically stored on other drives, say E: drive. These manifest themselves as of type "Backup" as opposed to "System" when trying to do System Restore. But the metadata are very small; it's the images themselves that take up space on the external HDD.

(a) So the relevant slider would be the Max Usage slider of the E: drive, not that of the C: drive, right?

(b) Additionally, according to Brinks' article and as far as only System Images are concerned, the E: drive's Max Usage slider would only be relevant if the System Images are created automatically on a schedule (and one selects "Let Windows manage the space used for backup history"). So if I am creating the images manually, or if I haven't set up Backup at all, the E: drive's Max Usage slider doesn't do anything—the drive will use as much space as it needs as I manually create one image after another?

(c) Bree's article states that the proper way of deleting older System Images is using methods described on Brink's article. But Brink's article doesn't provide a way to delete specific System Images. It's either deleting all of them, or retaining only the most recent one. And dragging the slider doesn't seem like a very precise way either (I'm not even sure it works as per point (b) above). So if I have created images A, B and C, and now I want to delete only B, how would I go about it?

(d) If I'm creating System Images manually, how do I dictate it to be incremental or differential?