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Well, you are on a free hosting forum here. What is your real question?
As a suggestion you should be realistic with your web hosting needs. Not everyone needs 150GB of space and unmetered bandwidth. Be careful of unlimited everything offers, because where can you buy an unlimited hard...
I would agree with Mehrdad[ regarding their suggestions. If you have any potential for abuse (DDOS) or have ----- content, hetzner is not the provider for you. They do not allow ----- content and will disable your server quickly and for an extended period of time for DDOS.
If you place the hard drive in an enclosure that has a connector, yes. They sell external hard drives that connect through USB.
Keep in mind that USB connections can be slow and it's definitely not going to be as fast as a direct connection.
It depends on three main factors:
1. Website traffic
2. Code optimization
3. Server optimization (using Nginx, varnish caching, etc)
It is entirely possible to only have 1 visitor on your website and your VPS becomes overloaded due to poor configuration of the script, having 1,000...
Have you thought about hosted solutions such as BigCommerce or Shopify? This way you don't really have to worry about the technical side of things, you can just focus on your products and building your business.