I'd like to save a "snapshot" of a SharePoint farm (installed/activated features, web.config files, SharePoint version, etc.).

The idea is to be able to compare such snapshot with the current state of the farm once an issue is identified and it's not easy to pin point what has changed since the last time the farm worked properly.

Is there any such tool available out there? Or something similar that could serve as basis?

Thanks, Joao