Today, Amazon DynamoDB announces the general availability of incremental export to S3, that allows you to export only the data that has changed within a specified time interval. With incremental exports, you can now export data that was inserted, updated or deleted, in small increments. You can export changed data ranging from a few megabytes to terabytes with a few clicks in the AWS Management Console, an API call, or the AWS Command Line Interface. Choose a DynamoDB table that has point-in-time-recovery enabled, specify an export time period for which you want incremental data, choose your target Amazon S3 bucket, and export.
Source:: Amazon AWS