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Automate Your Amazon DynamoDB On-Demand Backup For Multiple Tables Using Serverless Lambda. Using Cloudformation, Lambda and Cloudwatch, we can enable on-demand backup in every 5 mins interval. Point-in-time recovery maintains continuous backups for the last 35 days only. The following solution is less expensive as we can provide custom backup interval and retention period. The Cloudformation template has been used to keep the solution implementation minimalistic, refer the diagram above to know which services are being used to execute this.