Hi @Moustafa Ismail ,
nevertheless the upgrade from Windows 10 to Windows 11 will normally run smooth without loosing data: If you have valuable files/data on your computer I really recommend to create a backup of this valuable data before starting the upgrade! For instance copy the files on an external drive, usb stick, cloud storage, ....
Even if upgrades are running smooth 1000 times .... "Murphy's law" could hit hard in one of this cases ;-)
Better be safe than sorry!
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Regards
Andreas Baumgarten