neowin[.]net/news/microsoft-releases-dev-home-preview-version-02-with-some-improvements-and-bug-fixes/
learn.microsoft[.]com/en-us/windows/dev-home/
learn.microsoft[.]com/en-us/windows-server/storage/refs/refs-overview
Dev Home is intended for developers [coders] -- it helps setup a PC/laptop for coding work. The current Preview version is only available to Insiders. The reason for talking about it is that it also lets you set up what it calls a Dev Drive that uses ReFS, and is designed to be ideal for storing Lots of data, whether it's your backups or photos or games etc.