The size of RDS on AWS is growing exponentially every day

I set up an RDS on AWS. I'm using the free domain for my trials. There is only one table in the database and there is very little data in the table. But when I enter the free space used, it increases by almost 2 GB every day. I think he backs up one instance of the database every day and I can't delete those backups. Is there a way to turn this backup off or have it taken monthly, weekly?

I get the following warning when I want to delete the snapshot. Do I have to disable RDS to delete it?

You can't delete a system snapshot. To remove system snapshots for an active DB instance, modify the DB instance and reduce the automated backup window. To remove system snapshots for a deleted instance, delete the retained automated backup.

Update: The backup period was selected as 1 day. I changed this. How can I delete past backups?

You cannot delete a system snapshot manually, rather you can go to RDS, click Modify and go to Backup and change the Backup Retention Period to a lesser value, which will mean that old Snapshots will automatically get deleted after these many days or can keep 0 if you dont want any backup

And if you want to delete older snapshots, if they dont get deleted by changing the period to 0, you would have to delete the RDS and check the box to delete its snapshots as well