You might want to look at using JungleDisk. It requires an Amazon S3 account. They charge 10 cents per GB per month. JungleDisk will encrypt the data before sending it to S3 so your data is secure if there is some type of loss. They also have redundent data centers.
I also have heard good thing about Mozy... but it doesn't have the same type of control that JungleDisk/S3 gives you.
Good luck to ya...
BOb
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