I use Bvckup 2 ( https://bvckup2.com/ ) to backup on to a 4 TB external drive. I also have Duplicati ( https://www.duplicati.com/ ) running to backup those backups onto OneDrive and Backblaze.
I've been using it in place of robocopy for all my Windows backup needs for a while now, with rsync for linux. It's fast.