When you sign up for iCloud, you automatically get 5GB of free storage for your photos, files, and backups. You can upload, store, and share your data and access it from any web browser on an internet-enabled device. If you opt for the premium iCloud+ service, you can choose from three paid tiers that offer 50GB to 2TB of storage. You'll gain additional features like custom email domains and Hide My Email, depending on what level you choose.