I back up all my work email into a minimum of two personal folders per year, sorted by date. So PF1 is for Jan-Jun in a given year, PF2 is for Jul-Dec in any given year. Every other subfolder is similarly organized by date.
I delete nothing. Sure, I don't need to know today when a scheduled IT outage was planned in March of 2005. But who knows if I'll need to know that tomorrow?
I file things from my main Inbox into my PFs once I've read them and/or have completed the task associated with them. So as of now I only have 16 items in my main Inbox, and another 17 in various Inbox subfolders. For the sake of comparison, I have 2,604 items in my Jul-Dec '08 Personal Folder.
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