An ActiveStorage service option that uploads shares across one or more other storage services using Shamir Secret Sharing (via the tss-rb gem). Use it in your storage.yml file. It is not a mirror, but can be named as a storage service. https://github.com/johncallahan/activestorage-horcrux. A demo application is available at https://github.com/johncallahan/activestorage-horcrux-example