This is somewhat advanced and as far as I know, it can only be done via AWS CLI, and not in the console. If you are creating a lot of these, it can get expensive very quickly, so some people save these AMIs into S3, which is cheaper than EBS snapshots. Snapshots cost less than 'provisioned' EBS at $0.05 per GB per month, and since snapshots ignore empty blocks, it will be shrunk to used size, so if you are only using 5% of 50GB, the snapshot should only be around 2.5 GB. You will get an error if you try to delete this snapshot. This snapshot is viewable under EBS Snapshots and will not be deletable as long as that AMI is in existence. When you create an AMI, AWS will create a snapshot in the background. The charges will incur even if you forget to attach to an EC2 instance.
And if you provisioned 50 GB, you will be fully charged for that 50 GB, even if you are only using 5% of it. Provisioned EBS is the 'live' HD that will be charged at $0.10 per GB per month if using standard SSD (gp2, USA east pricing for 2022 used throughout). In short, yes, you will incur additional charges, but at a less rate, namely, EBS snapshot storage rate.
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