Regional storage invovles the storage, retrieval, and processing of files in an arbitrary AWS availability region.
AWS has regions all over the world. The regions that we are interested in are those in us-east, us-west, us-gov-west, and ap-southeast.
Storage services are all the services that interact with our S3 Buckets. The gist linked above has an overview of the major services.
Storage migration involves moving a company from one storage profile to another and copying their files into the new buckets.