is this you?
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i'm pretty sure your information is more secure in iCloud than on your home computer. anyone can steal your computer and take your data easily.
with iCloud, it would take a little bit of trouble to getting to your data.
If someone stole my computer, they'd have a pretty hard time getting through the encryption on my home folder if they wanted my data. Ditto on the backup drive.
On iCloud, your data's on a bunch of servers which are constantly fighting off hack attacks, unless you're someone who thinks, even after groups like LulzSec have hit so many sites, server farms are a perfectly safe place to store your data?
Also remember that it's also about who controls that data. If it's on your computer, you control it. You know where that data is and you know that it's deleted when you delete it and so on. Cloud services... Not so much. Facebook famously keeps all data from deleted accounts, and we have no idea whatsoever what Apple do with your iCloud data should you choose to delete it, meaning that this stuff could all be leaked if the service got hacked.
And hey, all it realistically takes for someone to get all of your data is for them to get your iTunes password. That's it. ONE password, all your personal data.
In the event of a wider scale hack of the service, we're not just talking about your name, address, and so on leaking, we're also talking about your personal data leaking. This not only makes identity theft easy, but it could end up potentially embarrassing for you personally. Happen to have a few naughty pics on your phone? Maybe some private e-mails to your iCloud account? Well they're now linked to your real life identity, publicly, online, forever.
Now, it is of course true that a desktop computer isn't 100% secure either, but the balance of probability says that a major server farm is a lot more likely to become the target of a hacker.
So, to conclude, I will keep my data firmly on my encrypted hard drives, and you can keep handing over all your data to Apple so they can learn all about you and keep your personal documents on some servers which you have no control over.