Safe deposit boxes aren't expensive and they're not a bad offsite location to store copies of you data on external hard drives. I don't really like using hard disks for long-term archiving but it's one of the lowest cost practical solutions. A tape drive would be something to look into but they're not cheap.
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When I started getting wrist pain from typing I learned to type on the dvorak layout. Your problem is probably less with the keyboard itself and more with what you're doing on it.
I also use a Model-M IBM at work and don't really care how noisy it is.. they're the greatest keyboards ever produced.