Basically create an add-in / configuration element in CA in 2016 / 2019 that enables a Farm Administrator to select a single or multiple Azure Storage Account blobs to operate as Remote Blob Storage, and conversely support this ability in O365. Then for migration you would leverage the migration tool to migrate list data and metadata for documents - but just reference documents in azure storage -- for lots of my customers that would greatly simplify migration - you could create multiple blob storage accounts which could all be loaded independently - or we could figure out a way to load files into azure databox along with metadata (perhaps in azure tables format) that we could then easily import Not moving those files into / out of Office 365 presumably could greatly increase the speed of migration and simplify it for our customers where they have massive amounts of files on premise.