I made the default folder to be on an external hard drive, I then told it to always save a copy of the original, I then put it up to 100%.
Well, it still just saves them to my computer hard drive, it creates a folder on the external hard drive in which sometimes it seems to be storing them, but then it's on the computers SSD as well.
The reason I want to do this, if I take 500GB of photos this Autumn and just put it all in Adobes Cloud and they have any kind of hiccups all of my originals are gone, no backup.
Also, at some point I'm going to go over 1Tb and I'm not gonna pay for 2Tb, I'll have to just clear photos out.
If you are using the latest version of Lightroom CC then, yes it is possible to copy the images on local drive and also sync to the cloud.