C:\Windows.old created even if I did not upgrade to any new Windows version?

[Windows Server]

Hi, I do not understand why today after doing a Windows update it created a C:\Windows.old.I did not choose any optional update when I started the windows update. I see a feature that got installed in my update history:Aren't feature updates done by choice only? If yes, it was not very clear on screen even it was listing what updates to be done. I tried to see what this update is about and it only brought up a window about "Discover tips online". Clicking it the displayed info seam to be for a pre-Windows 11 upgrade info because it says starting Oct-2025 Windows-10 will no longer receive u

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