Aye. Mirroring is more about availability than security. You want a backup. Besides, with a backup you can keep several generations or even backups of several drives. Add a second if you want rotation or an offsite (safety deposit?) copy. The process is easy and there's free smart software for any platform.
Don't worry about USB cost. the price of enclosures or even drives in enclosures is dropped like crazy. Just last week Staples had a 320GB WD drive in a USB enclosure for $89. Keep an eye on fatwallet et al for similar stuff.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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