Syncing photos to iCloud
I have a large library (over 1 gb) of photos on my desktop. They are already backed up. I just for the first time signed up for iCloud. Not using it for my mac photos library. Using it for other reasons. However, I previously used photo stream (which goes away in 2 weeks). That way, all photos taken on my phone, my wife's phone, and my iPad ended up on my mac.
I can't use iCloud photos on my mac, since it is such a large library. Not enough room in iCloud. Is there any way to have all NEW photos taken on my devices sync to iCloud, and show up on my mac (like they did with photo stream) but without syncing the the pre-existing photos on the mac library to iCloud?
Thanks
iMac 27″, macOS 10.14