Soring files on Icloud from external HD
hi,
I use an external HD to store my photos (50,000) and am looking into start using icloud for an extra back-up. My question is can I back-up to icloud from my external HD or do I have to import all my photos into the Photos program on my Imac and then back-up? I went to an external HD to get away from having them on my computer to save space. So I'm hoping I can just upload from my external HD.
iMac, iOS 8.4