As exciting and reliable as iCloud backups are, it’s better that you understand exactly what is being backed up for you. You might be surprised to learn what information doesn’t get copied as part of the backup: things like your contacts, mail, notes, files you store in iCloud Drive or photos, if you have iCloud Photos turned on.
iCloud is a cloud-storage software offered on all Apple devices since 2011. It can securely keep your photos, music, videos, documents, and apps on the cloud server for easy access at anytime.