Harnessing electronic wisdom

I was thinking about how little time we take in this fast-paced world of high tech and innovation to reflect on what's the downside to that. Every day one traditional way of life is superceded by another new technological advance: letter writing giving way to email, love letters replaced by e-cards, for example.

In fifty or a hundred years, will there be famous letters found in filing cabinets from our movers and shakers of today to be pondered over and dissected by scholars? I think it's more likely they will have ended up in a Recycle Bin, never to be retrieved because their importance was unrecognized or fleeting back then. So what can we do to save all these words of wisdom, or even of love, from vanishing and stop destroying what could be historical documents, albeit in electronic form?

Any ideas would be appreciated. Thanks!