If my system crashed and I lost all my Outlook information, I'd be lost. There would be people I couldn't call, lost messages I couldn't reference. Hours of my life would be wasted trying to recover. Having a backup strategy for your email is vital. It's not good enough to come up with a backup plan; you need a backup plan that runs automatically, so you never need to worry about turning it on. Here's the steps I take to backup Outlook automatically. You can apply a similar strategy to almost any email program.
For more on backing up your PC, read through these tips on:
6 Steps to Buying Backup Software
Hard Drive Data Recovery becomes necessary if you never had a backup plan.
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