Very often the users *don't* *know* where they save their crap. It's just "on the computer". The biggest task of the walk-around on the next day is walking users through File-Open dialogs as they all just fetched files via the recent files dialog. "Why aren't my files in the recently-opened files list?" Because you haven't yet recently opened any files yet!
On some systems we discovered users saving files inside application directories - which really bit them when the OS or application was upgraded or, worse, the license expired and the application killed itself.