Once you confirm deleting your Facebook account, Facebook gives you 30 days to save your data elsewhere before permanently removing your account from the platform. You must remember that, once your Facebook account gets deleted you shall not be able to have access to it nor can you retrieve it. So, it is always advisable that if you are unsure about deleting, try to deactivate the account. And if you are deleting then prior to deleting it, save your data elsewhere.