FileShadow has released the FileShadow Desktop App. It aggregates files stored in Apple iCloud with other cloud storage systems, along with local and direct attached storage (DAS), including Drobo direct attached appliances with support for the newly announced Drobo 8D. 

FileShadow connects the majority of all cloud and macOS storage options into one secure cloud vault, delivering a single consolidated catalog of files. With the app, files and photos placed in iCloud from a Mac, a browser, an iPhone, or any Apple device can become part of the FileShadow archive. 

The FileShadow Service is free of charge for up to 100 GB of data. Subscriptions are available for more storage ($15/month for 1TB; each additional terabyte is $10/month).