AEM6.5 | Tools for Content Migration

Data Importer - https://adobe-consulting-services.github.io/acs-aem-commons/features/mcp-tools/data-importer/index.html

Metadata Export and Import- https://docs.adobe.com/content/help/en/experience-manager-learn/assets/metadata/metadata-import-feature-video-use.html

You can use cyberduck to synchronize folders on your local AEM instance to the s3 bucket. 

https://cyberduck.io/download/

Cyberduck has the S3 transport as an option.