可用性：如何为我的用户提供并轻松部署（最好是基于node.js + MongoDB的）服务器后端？

I'm currently planing an application (brainstorming, more or less), designed to be used in small organizations. The app will require syncronization w/ a backend-server, e.g. for user management and some advanced, centralized functionality. This server has to be hosted locally and should be able to run on Linux, Mac and Windows. I haven't decided how I'm going to realize this, mainly I simply don't know which would be the smartest approach.I'm currently planing an application (brainstor