An excellent solution became available for Amazon Cloud Drive that works wonderfully! The interface to Amazon Cloud Drive, provided by Amazon, leaves much to be desired. There is a web interface and PC application, neither of which work very well except to do a one-time placement onto the server.
SyncBackPro recently implemented an Amazon Cloud Drive interface. This is different from their Amazon S3 and Amazon Glacier interfaces. I can't believe how well it works. It is a bit slow initiating upload on a file by file basis, but once it begins processing a file it goes at the limit of the connection. SyncBackPro has excellent accountability over files processed with a good visual representation and good logging. It's a very nice piece of software. I like the "mirror" feature which will delete from and add to the destination as necessary to match the source.
The setup was so simple. I merely started an "everything" account for Amazon Cloud Drive. SyncBackPro took me to one-time Amazon authentication page, a key was exchanged, and that was it, with the least amount of interaction possible.
Amazon Cloud Drive "everything" costs $59.99 per year and according to customer support accepts up to 200 terabytes under this plan. I'm very glad I held out. This seems to be the best value for the money. SyncBackPro costs $54.95.