I would like to create a mobile web app using Sencha Touch 2.
There are several questions I want to ask here, can I use my own server(company)? or Sencha limit us must use their server? Sorry but I couldn't found any resources out there.

For example, my application will let peoples to register their name, password and etc. I want all these data to be store in my server rather than others(Sencha's server). Can we do that? The application might push to the market after well developed. If we use Sencha's server, how much they will charged? Charge per user?

Correct me if I'm wrong.