You need both of these, with regular check-ups. You obviously haven't done enough research on your own, and from what it seems you aren't quite fit to run a hosting business, as you don't have much knowledge of how things work.
To understand why it's impossible to do this out of your house, just ask a local ISP how much it would cost if they were to pull fiber over to your house with a 100mbps or 1gbps capacity.
I'd recommend sticking to either colocating in a proper datacenter or renting dedicated servers.
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IMO if you are looking at dropping that much money into a hosting business you would be better off working with a colo facility and renting a rack to house a few smaller servers. That way you would have a redundant network and power. If you use multiple servers instead of one giant piece of hardware you can spread clients over the machines and not have to worry about all of you clients going down if the hardware fails or needs service.
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I agree with KmacK. I do realize the bandwidth to residential properties are increasing, but don't let that fool you. There are a bunch of other perks needed to operate a redundant data center which is specified above. Good luck on your decision.
I would absolutely suggest going with a company that offers management, leasing dedicated solutions will be your best option. In case of any hardware failure as well as support, the hosting company will provide you with coverage, thus being cost effective and a major time saver. Some companies do provide discounts on monthly server packages if you are looking to lease more than one solution
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One way to do this would be to buy a server from apaqdigital.com and then colocating at somewhere like FDC. Then pick up a management company on the side like Platinum Server Management to manage the servers.
That way you can have your server (s) and have your desire for unmetered bandwidth filled at a lower cost than leasing.
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I saw scrap the idea about starting your own DC at home. There are too many things to worry about. HVAC, power, redundancy, and ISPs. If you do well enough, you'll have to expand to a real DC anyway. Why do you want to make your home into a DC instead of a real DC?
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