JF Server storage config advice?

[JustAnotherDude]

I would use Linux, distribution is not terribly important. mdadm to setup your your two HDDs in a mirrored raid array, giving you a single 16tb storage that will persist if one drive fails, and no extra raid controller needed.

Your upload speed and drive read speeds can likely handle 50+ streams at a low bitrate, but I am skeptical that your cpu can handle it, and I don't think the old amd gpu will handle transcodes particularly well.