Server buying

Hello!
I don't like that servers close when there are no players on them, but I understand why you have to do this.

Where can I buy a server? And how much does it cost?

I don't really understand how that works.
So the more RAM I select, the higher the price, obviously.
But that's the price per hour played right?
So why is there a slider right under that for number of hours (up to 16 hours). What do those 16 hours mean?

And If I max everything (16 GB ram with 16 hours), it says 3.84 euros (256 credits). What is that 3.84 euros? Per hour? Per day?

I found an article about pricing.
So from what I understand:

The cost for running is 1 credit per 1 GB ram per 1 hour and 1 credit = 0,015 euro. So a server with 4 GB ram would cost 0,06 euro/hour.
Storage costs 10 credits per month, which is 0,15 euro.
So if I make a 4 GB server and play on it for 6 hours per day, it would cost me 6 x 4 x 0,015 + 0,15 = 0,51 euro per month?

Is my math correct?

Okay, I understand now. Thanks for the replies. Close topic please.