
Photos: If you’ve enabled the iCloud Photos feature from Settings > Photos, all the photos from your Camera Roll will be uploaded and backed up to iCloud (given you have enough storage space).iWork Apps: All the data that you have in the Pages, Keynote, and Numbers app will be uploaded and stored in iCloud, which means that all your documents are safe even if you lose your iPhone or iPad.Notes: All notes and attachments in Apple Notes app on all your devices are synced and saved to iCloud.

Calendar: All calendar appointments made using your iCloud account will be backed up to iCloud servers.Contacts: If you’re using your iCloud account as your default contact book account, it will sync all your contacts to iCloud servers.Here’s everything that iCloud can back up and sync to its servers from your iPhone, iPad, or Mac:
