Hi. I'm happy to say, it's compatible. I just had to do some calculated risks and the risk paid of well. Windows 11 is restoring all my files and documents, all at the same time with just one click of a button, just fine with a Windows 10 File History (you have to press from Previous File History before you Turn it On).
Windows 11 is more responsive. I do however have to reinstall all apps, hopefully they all Windows 10 apps are all compatible. It has a bit of advantage compared to restoring with Time Machine (but Time Machine is more elegant) coz' you can restore everything after you've booted to Windows 11.
It's best to update Windows 11 first, then turn off the internet and networking, not install any anti-virus or any programs (not use it yet) and the no internet until all files are restored, turning off the firewall. I take it back it what I said, I guess Time Machine restores everything first before letting you use it so there's no problem with anything.
God bless, Rev. 21:4