Credits go to https://rays-blog.de/2019/07/17/310/backup-to-microsoft-onedrive-with-synologys-hyper-backup/ as I've copied most of it :).

Install a proxy Docker image on Synology

Run the basic-to-passport-auth-http-proxy Docker image and configure a WebDAV backup destination in Hyper Backup.

Just install the above Docker image (search for skleeschulte in the Docker browser in Synology):

  1. Configure the local port (I've used :3001)
  2. Add a variable named PROXY_TARGET with the value https://d.docs.live.net/
  3. Start the container and check logs (it should be running just fine)

Configure HyperBackup

  1. Get your OneDrive CID: navigate to https://www.onedrive.com/ and log in to OneDrive. When the browser has finished loading the OneDrive interface, the address bar should show something like https://onedrive.live.com/?id=root&cid=ABCDEFG123456789. ABCDEFG123456789 is your CID
  2. Create an application password in your Microsoft account. This would be a your password to use with your CID
  3. Create a new WebDav task in HyperBackup:
    a) Server address: localhost:3000/ONEDRIVE_CID
    b) Username: your OneDrive username (= email address)
    c) Password: your OneDrive application password
    d) Select proper folder and finish the backup task
  4. Profit