If we want to avoid running out of bounds with disk space we need to put document and file retention policies.
For expiring content automatically you may find the Confluence Archiving Plugin useful. For more of a manual approach I wrote a user macro that will list all the pages in a Space that haven't been updated for a certain period of time, details on my blog.
I'm not quite sure what you mean by "tag files I just haven't found yet". Is that pages you haven't visited?
Bernd, there is a blog post written on this exact topic: http://www.kikamaca.com/2011/08/managing-content-in-confluence-archiving-and-retention-policies/
This is thorough, well-written and you may also find this extremely valuable.
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