After updating and joining my world, I notice in the /world folder the 'old' version of my map before the new update and a new version. What happens to the 'old' worlds? Can they be deleted from the asset tree via Win Explorer? or is there some special way to remove these old files because of the cloud backup?

I'm assuming that the program sends all files in the asset tree up to the cloud?? Would I need to Win delete them offline and then go back online to get the prompt to either use the cloud or the stored version on the HD....?