After your subscription is canceled, Microsoft waits 30 - 90 days before permanently deleting your data in case you need to access it or you change your mind. We don't charge you for keeping the data.
https://video2.skills-academy.com/en-us/azure/cost-management-billing/manage/cancel-azure-subscription#what-happens-after-i-cancel-my-subscription
https://www.microsoft.com/en-us/trust-center/privacy/data-management#leave
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