you should try using aws ec2 create-image, aws ec2 describe-images, and aws ec2 deregister-imageu ld together. other than that anything you can do on a web console can be done through cli too.
AWS lambda would be a right solution to automate the backup of your ami and clean up. You can schedule the lambda function (basically a python code) to run periodically. This way you don't need to have your ec2 running all the time. An example here http://powerupcloud.azurewebsites.net/2016/10/15/serverless-automate-ami-creation-and-deletion-using-aws-lambda/
You can use https://github.com/alestic/ec2-consistent-snapshot and run it in a cron job. It supports various filesystems and has support for ensuring database snapshots are consistent. If you don't have a database in your instance, it will still ensure consistent snapshots by freezing the filesystem.
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