Why in my bills page, the occupied rds space storage is increasing even if I have only one mySQL database instance which is basically empty?

Question

I'm using the AWS free-tier plan which includes 20GB of free RDS storage space. 
I have created a mySQL db instance only to experiment a bit with the aws ecosystem.
I have disabled automated backups and all what does not  strictly concern about my database.
My database contains only one or two tables with few rows, at most 1 MB of storage, this is confirmed by the free storage graph in the monitoring page of the instance which shows a straight line on 200GB from when the database has been created.
However in my bills page (in the section "Amazon Relational Database Service Provisioned Storage") i see that the occupied storage increases day by day by more than 2 GB.

$0.00 per GB-month of provisioned GP2 storage under monthly free tier running MySQL: 20GB

$0.137 per GB-month of provisioned gp2 storage running MySQL: 57.80

Could someone help me?

I see that other people had the same issue ([see this question](https://repost.aws/questions/QUX6WZLosRR2OA44qYau5yWw/0-115-per-gb-month-of-provisioned-gp-2-storage-running-my-sql-i-have-created-only-3-tables-in-my-database-and-it-doesnt-contain-any-data-at-all-my-bill-shows-169-gb-of-usage-just-for-12-days-help))

Answer

Hello,
You're saying "a straight line on 200GB" - but the free tier is only for 20GB, you're billed for the extra 180 GB.

Answer

I believe he added an extra 0 by mistake. I am experiencing the same issue.

In my case, when I first configured the DB with all free tier configurations, automatically the system generated the DB with a backup policy of 7 days, and I believe that was generating extra space.

Then I disabled that configuration, now I have no backup policy. But the costs are increaging day after day!.

What else could be?

$0.00 per GB-month of provisioned GP2 storage under monthly free tier running MySQL20.000 GB-Mo$0.00
$0.219 per GB-month of provisioned gp2 storage running MySQL3.678 GB-Mo

I have lost a lot of time configuring RDS for the free tier and this hiding costs are telling me not to use this.

Why in my bills page, the occupied rds space storage is increasing even if I have only one mySQL database instance which is basically empty?

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