Amazon's desktop app supports batch uploads and downloads, but not sync to/from Amazon Cloud Drive.
However, there are 3rd-party options for this:
• Arq: https://www.arqbackup.com/
• odrive: https://www.odrive.com/amazon
• Synology Cloud Sync: http://www.macdrifter.com/2015/06/synology-cloud-sync-adds-a...
