However I should clarify: One of the reasons I want to move my data to a cloud server is that I am running out of space for more hard drives on my PC.
So syncthing will work for editing stuff on my local and syncing the changes with my cloud server. But I don't want to store all my data on cloud _and_ on my local PC. I want something where it is usually stored on the cloud server, but where I can bulk edit/organize the data selectively on my local machine.