I cloud
I don’t have enough storage on my phone. I’ve backed up my photos on the cloud and now I want to delete them on my phone but it tells me if I do that it will delete them from my cloud as well
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If you turned on "iCloud Photos" that is not the same as iCloud Backup. Indeed you cannot back them up to iCloud Backup.
iCloud Photos is a sync to all devices feature. If you want to save space use the Optimise Storage feature in Settings, General, iPhone Storage.
Or download/import all your Photos to a computer and sync some or all of them back to the phone from there.