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Give us more info on what forum are you going to host there? How big will it be? Which specs are you looking for?

Which location are you looking for? What is your budget for the server?

Hi, you mean you're looking for a DMCA-free hosting? Which location do you need? What's your budget?

Will there be DMCA content?

Yes, dedicated server is a bare metal server that you use, and it's resources are your only.
Virtual server is a bunch of resources that are located to a client from node or cluster, where there...

Would you kindly define what you mean by offshore?
It has to be from another country than you are? Or it has to ignore DMCA and another abuses?

Usually everyone must decide what's better for him, if you have a low load project you can use cheap VDS.
If you have heavy load projects that needs more powerful configuration - you should chose...

Depends on your e-shop and mostly on user amount. Try to choose the cheapest one, if there are any issues - upgrade it, and make sure to backup your data frequently!

If it's just a forum - it'll depend of the amount of active users, in most cases - VPS will be just fine.