Pretty much forever. Somewhere along the line my 1993-2002 archives went missing, but I still have everything since then. On average, I'd guess that it's about

Pretty much forever. Somewhere along the line my 1993-2002 archives went missing, but I still have everything since then. On average, I'd guess that it's about once a year that I need to access something more than a year old (and yeah, sometimes it's something from 2003). Why do you ask?