You can sync specific files and folders to OneDrive on your computer under "Preferences" in OneDrive's "Help & Settings" menu ...
You can add OneDrive to the File Explorer in Windows 10 by connecting your OneDrive account to the computer.
Interestingly, Microsoft doesn't let you set up a copy of Windows 11 without an active internet connection. Unless, of course, you use a workaround to install it without connecting to a network. This ...