Most people don't truly value their digital data until they (unfortunately) have to deal with a catastrophic failure of a hard drive or other data storage device. Only then they realize that having backups, something you can do using a simple external hard drive - and/or using the many cloud storage services available today (Dropbox, SkyDrive, etc.) - is an absolute must.
And when it comes to data loss, there's nothing as horrifying as losing photographs and home videos. Documents can be recreated, songs and movies can be downloaded again, but photos and home videos... that's something you won't be able to get back... ever.
But even if you have a nice backup system in place, there's still a small window that can leave you vulnerable to data loss - and that while it will be more critical for professional photographers, it's annoying as well for any other person. Just imagine you got the shot of a lifetime, and when you try to transfer it back to your PC... you get a corrupted memory card with no retrievable data in it.
Higher-end cameras allow you to have two memory cards, storing your photos in both and saving you from this kind of trouble. But if you have a camera with a single compact flash slot (or should you take things so seriously as to have triple backups in-camera), you can now use one of these Mirrored Compact Flash Cards.
Although you can still use it as a regular 64GB CF card, the most interesting thing about it is that you can use it as a dual 32GB CF card. You get half the usable space... but twice the peace of mind. Meaning, when you snap a photo, it will be automatically stored in two different partitions, making it a lot less likely that you'll need to worry with a corrupted memory card. Of course, keep in mind we're still talking about a single card - and that it may still malfunction and leave you with nothing - but at least it will be a lot less prone to the most common issues caused by memory errors.
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