Aram and Armando - either you misunderstood 40hz or I did! I think that suggesting that any e-mail you can't afford to lose be printed and kept as hardcopy is excellent advice. My understanding of this is that particular e-mail messages, like the last message your grandmother sent to you before she passed away or a nasty exchange of e-mail with a colleague that you have filed a complaint against, be backed up in hard copy. Everything else trust to your electronic archive. As I said, I learned this the hardway as I have a bunch of e-mail black holes in my archive: everthing from 1994 t0 2000, everything from 2000 to 2006, everything from mid-2006 to November 2007... This includes every e-mail my grandmother ever wrote to me before she passed away in 2000

So, I'm not advocating printing EVERYTHING, just those messages that you really want to keep.
NB It probably IS easier to keep everything now without printing to paper: in the past two years Hotmail, GMail and Yahoo have gone to astronomical limits on personal e-mail storage (after years of tiny limits) and harddrive capacity has gone through the roof while the cost has gone through the floor.