Now that you've backed up your iPhone, you can erase it. Go to Settings > General > Transfer or Reset iPhone. Select "Erase ...

If you’ve noticed a large System Data section in your iPhone storage, you’re not alone. It includes cached files, temporary ...

When an iPhone suddenly refuses to install a new app or take another photo, the culprit is often a mysterious bar in Settings labelled “System Data.” Instead of music, photos or apps you recognise, ...