@mstan — sorry that you haven't received a response.
NodeBB doesn't save the Mongo database anywhere specific on the file system, it would be wherever the insulted MongoDB install saves it's data.
Is anybody having problems on self hosted site with Slick template? Widgets don't work and loading bar keeps repeating at the top of the page (when I say loading bar I mean the blue effect across the top when it loads). Other themes are working fine. Tried reinstalling rebuilding etc, nothing to be done.
Yeah it needs the widget areas I think those were added in 1.6.0, I will see if I can send a PR tonight. https://github.com/pichalite/nodebb-theme-slick/issues/10