Photos
iCloud stores full-sized versions of all your photos and videos, and keeps smaller versions on your devices — saving space as you need it.
Backup
iCloud backs up your iOS devices at night when you’re connected to Wi-Fi, so you can easily access and restore all your information — including your iMessage and purchase histories — if you replace a device.
Docs
With iCloud Drive, you can store any and all files, and browse them from any of your devices. Just download the ones you need, when you need them.
Email
All email messages in your iCloud Mail account are kept in iCloud, where they’re easily accessible on your devices and iCloud.com.