If you want to move back and forth from Windows 10 to Windows 11 and Windows 11 to Windows 10 this may be able to performed in less than one hour with backup imaging.
This then would enable a computer user to test drive an operating system and at any time to return to the operating system of preference.
Method:
Make free or pay backup images and save the images to another disk drive or the cloud.
Restore an image whenever you want to return to the preferred operating system.
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An upgrade from Windows 10 to Windows 11 has a default 10 day go back period.
The go back period can be modified to 60 days.
The process can be repeated.
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These are some third party software for making free or pay backup images:
Acronis, Aoemi, EaseUS, Macrium, Paragon, etc.
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https://learn.microsoft.com/en-us/lifecycle/products/windows-10-home-and-pro
https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-21h2
https://learn.microsoft.com/en-us/windows/release-health/resolved-issues-windows-11-21h2