There is a difference between the Inbox and Storage

The Inbox is a medium which contains items that change frequently. It is a temporary place that holds new information in the short term. It’s like a tail for our life as Merlin Mann said it. → 2.14.12

The Storage is a place which holds processed information on the long term, optimally organized in some form of fashion (2.8.2.4.5 The file system is a backend for our projects). Organization categories should have clean edges, so we know what to store where.

By using these two information holders, we can separate the processing and organization part of #GTD.