Can I back up my photos on my iPhone using my iPad
Can I back up the photos on my iPhone using my iPad
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No, you cannot. iPhone photos if not using iCloud Photos to hold them, are part of the iPhone backup. If you are not using iCloud Photos, then you can connect the phone to the computer and import the photos to the computer for safe keeping. See this, Transfer photos and videos from your iPhone, iPad, or iPod touch to your Mac or PC - Apple Support