icloud+ feature
Can you copy all of the data files from a PC to the icloud+ storage site?
Windows, Windows 6
Can you copy all of the data files from a PC to the icloud+ storage site?
Windows, Windows 6
You can manually copy any files you want to the iCloud Drive folder in Windows Explorer if you want.
click here ➜ View, add, or remove iCloud Drive files in iCloud for Windows - Apple Support
There is no automatic backup process to copy all files automatically to iCloud however.
icloud+ feature