Windows 11 Upgrade
Switching from Legacy Bios Mode to UEFI Mode without losing Data
Switching from Legacy Bios Mode to UEFI Mode without losing Data
Background information:
Back up your data first
Create a system image on a separate backup drive:
Using built-in Windows too (Backup & Restore Win 7): https://www.howtogeek.com/4241/how-to-create-a-system-image-in-windows/
If needed, instructions to restore from a system image: https://www.howtogeek.com/239312/how-to-restore-system-image-backups-on-windows-7-8-and-10/
Using Rescuezilla/Clonezilla: https://rescuezilla.com/download
If you are running only a single drive with Windows 10 on it:
Dealing with possible errors