That file disappeared a few years ago, replaced by settings.ini. See this:
As for your 1.2 GB of data, clearly this will depend on how many feeds, their feed interval and their type – variable interval time series take approximately twice as much storage space for the same number of data points as fixed interval.
I think you might be – it is 3 lines up from the bottom of this screenshot, it’s just that this is not of the page you were looking at.
