Step 1. Install and Activate UpdraftPremium or Microsoft OneDrive Addons for UpdraftPlus
Step 2. Updraft Settings
Settings > UpdraftPlus Backups > Settings > Click on Microsoft OneDrive
Scroll down and Enter OneDrive Folder
Scroll down and click on Save Changes
Then Click on “After you have saved your settings….”
Sign in to Microsoft Account
Click on Yes
Click on Complete Setup
Step 3. Backup Your WordPress Site to Microsoft OneDrive
Settings > UpdraftPlus Backups > Backup/Restore > Backup Now
Backup Now
In-Progress…
Done!
and Here is the Backup file
and in OneDrive Folder
and here