@morph@morphnet.de NodeBB doesn't require much memory at all. It does need maybe 1gb to build static resources.

Running it itself shouldn't need more than 500mb.

@julian That sounds good. Thanks for the info. I think I'll install NodeBB soon, and also Mitra. I got even an idea for a use case. Well ... and a potential community of 3-4 people.
And of course thanks a lot for your fascinating project and competent work for the Open Social Web at all. Ehm ... I'm not so good in compliments.