I use arq, and I can highly recommend it. It's definitely fast, but more importantly, it has an agent that works in the background, has a great UI, is highly co

I use arq, and I can highly recommend it. It's definitely fast, but more importantly, it has an agent that works in the background, has a great UI, is highly configurable, unintrusive and light on the CPU load. I use arq with Amazon S3/Glacier, and the monthly bill is in the cents.