Guspaz wrote:
S3 is expensive.
Yes, it is
But not everybody who runs a Linode 1536 has 48GB of data, and the good thing about S3 is that your fees are proportional to the amount of data you need to store/retrieve. If you only have a few hundred MB of data, S3 is cheap. If you have a few hundred GB, on the other hand, there are much better options. (Of course, if you're worried about a datacenter being hit by an earthquake, you'd need something like S3.)
Other solutions: BQBackup, rsync.net, Tarsnap, etc. But I don't think any of them would be a good fit for the OP, because he can't (and/or doesn't want to) use a credit card or PayPal. So unless he's planning to host something anti-Chinese, his best bet would be to use his home computer as a backup machine.