I need the feature to be able to sync not just local folders on your PC, but also from external drives attached to my PC.

I read that this can pose a safety threat. But I still very much like to have all my data stored on a cloud and a physical drive in case I lose access or have any other problems with my cloud. I am currently using pCloud, and they allow that. That is quite the essential feature for me.

So please allow syncing with external drives as well.