backup-onedrive-to-external-hard-drive

To back up OneDrive files to an external hard drive, sync or download your OneDrive folder to your PC, connect the drive, and copy the files over. For automated backups, use Shoviv OneDrive Migrator or File History to back up directly to the external drive.

https://www.shoviv.com/blog/how-to-backup-onedrive-files-to-local-drive/