Synology Cloud Sync
The Synology Cloud Sync synchronises files between the NAS and Cloud providers (e.g. Google Drive, Dropbox, Amazon Cloud Drive).
Similar to Cloud Station, synchronisation direction can be set to either two-way or upload only or download only. Bandwidth limit can also be imposed for upload and download to avoid choking the Internet link.
I am using Cloud Sync to backup my digital memories (i.e. photos, videos, audios) to the Amazon Cloud Drive for additional copy of the backup. Basically, the folders backed up using Cloud Station are Cloud Sync-ed to Amazon Cloud Drive. As the Amazon Cloud Drive features unlimited storage, I backed up the original untouched uncompressed contents.