My internet speed is 100/40.
I wouldn't be suprised if it was some sort of throttle, since everything was working fine initally.
OneDrive is now 1TB, though there should be a way to change it. In anycase I didn't consider disk quota simply because my OneDrive has plenty of diskspace.
Yes there is a lot of small file since it's mainly documents and smaller images.
I guess I'll keep trying. I read in another thread that somone tried running rclone on another server and that seemed to do the trick. Is it worth going down that route?