icloud photos backup questions
Let's say I have 1000 pictures in my phone and I want to clean out for phone space. I back up all 1000 pictures to icloud and then turn off my phone icloud backup before delete all pictures from my phone. Now I have 0 pictures in phone but still have the 1000 pictures in icloud. My question is till next time I have another new 100 pictures in my phone and I want to back up to icloud again, will the 100 new pictures overwrite the old 1000 pictures in icloud ? what is the best solution for this, adding the new 100 pics but still keep the old 1000 pics ?