: This balance is shared across all Apple services. If you purchase apps, movies, or other subscriptions, those funds may be depleted sooner than expected.
: If you have an exceptionally old annual plan that has never been interrupted or changed, it may still renew annually, but these cannot be modified or re-purchased if cancelled. Current iCloud+ Monthly Tiers iCloud+ plans and pricing - Apple Support can i buy icloud storage annually
No, you cannot currently buy iCloud storage on a standard annual plan. While Apple offered yearly options in the past, they transitioned to a strictly monthly subscription model in 2015. : This balance is shared across all Apple services
: You can manually add funds to your Apple ID balance or redeem Apple Gift Cards to cover the cost of 12 months at once. Current iCloud+ Monthly Tiers iCloud+ plans and pricing