Hello guys, I just got a motherboard, a CPU and a 8 bay case (Node 804) as a deal and was thinking to getting other components to make a home server.

It would be unrealistic for me to buy all 8 HDDs at once, I can’t afford to do it. Also, I guess I should also take into account the HDDs for a backup device, and a spare HDD to keep around when needed.

So the question: what’s the best way to start gradually? If x is the total capacity of the main device, how much should it be for the backup device?

Just for the record: I already have a 6TB WD RED HDD hanging around, connected to an Odroid HC2.