Sap SuccessFactors - Best Way to import data to S3 data via batch job

Your current approach is good. You are correct in that AppFlow doesn't currently have a SuccessFactors connector.

An alternative, if you're using SAP Business Technology Platform (BTP) - Cloud Integration Suite - is to use the AWS BTP Adapter to push this data to S3 as an endpoint in your integration flow. This can be helpful if you've already integrated SF with SAP ERP through Cloud Integration Suite - you can modify or extend the iFlow.

Further details in this blog: Integrating SAP Systems with AWS Services using SAP Business Technology Platform .

NOTE: This answer is provided by the SAP on AWS specialty team and is accurate at the time of publish. Please check comments as the answer may have changed/services evolved.