I really like the sound and look of TarSnap, but the pricing is in "pico dollars per gigabyte-month" (currently twenty-five cents) for storage and transfer. Sounds cheap, but by my calculation that's $250 per terabyte per month for storage, plus the same cost for uploading it.

I have two terabytes of data so assuming a generous 50% compression and de-duplication ratio, that's $500 for the first month, and $250 every month thereafter. Great for a business, not so great for a prosumer.

If price were no option, I'd probably use TarSnap.

I might still use it to back up a few important text files, though, which I'm sure is the actual intended purpose.