Minio is software you can run on your own servers to give you cloud storage that is compatible with AWS S3.
A Synology DiskStation is a kind of server you can run at your home. A common use case is as a home media server, but it is general purpose enough that you can run just about any server software on it.
I want to be able to pretend that my DiskStation is another instance of AWS S3, and these guides helped me set that up quickly.
The only additional step I had to take was to set up my router to pass through traffic to port 9000.