Issue: I have 64GB 6S. I need to get it repaired, and the authorized service center said they needed to send my 6S to Apple (I'm in Singapore) and they only have 16GB iPhone 6 as a loaner. I am trying to trim down my 6S. Currently I managed to trim things down to ~19GB. Photos are ~6.8GB. I have enabled iCloud photo library. Now, there is a setting in iCloud photos to only download "optimized" photos to the phone instead of the originals. I know iTunes backup is all or nothing, so in order to fit things to the 16GB iPhone, I would probably need to trim a lot more down. The question is iCloud backup. Since the I have iCloud photos, will I be able to use this to restore things to the 16GB iPhone? (meaning the restore is smart enough to not include the photos).