How much does the cloud cost?

You get 5GB of free storage in iCloud. If you have more data needs, US pricing is 50GB is $.99/month. 200GB is $2.99/month. 2TB is $9.99/month

If you are in a different country, see this link --> iCloud storage plans and pricing - Apple Support

iCloud storage plans and pricing - Apple Support

Upgrade your iCloud storage plan - Apple Support

make sure you understand that buying iCloud storage does not expand the capacity of your iPhone

What's the difference between device storage and iCloud storage? - Apple Support