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Reduced S3 costs by 60% with S3 Glacier Instant Retrieval storage class
Amazon Web Services (AWS): S3, EC2, SQS, RDS, DynamoDB, IAM, CloudFormation, Route 53, VPC and more reddit.com
Our S3 storage was a bit unoptimized and with bucket analytics and lifecycle rules, we've managed to reduce the costs from $3400/month to $300/month.
The last piece of the puzzle was to switch from Standard IA to Glacier Instant Retrieval which enabled an additional reduction of 60% on top of everything we did already.