I have gigabytes of mail archives from days gone by and I’m never ever looking anything up in it. I hardly look at pictures in my photo albums, either. Nor do I read my old journals. So who is it for? Nobody, as far as I can tell. It just sits there, growing.
I thought I would have a canonical place to point to describing how I process email (hint: I delete it). I consider most things digital chaff, and my actual archive is interi.org.