I've been using www.SMEstorage.com for this. They support multiple storage clouds as back ends, and have DropBox style tools that give me automated sync between

I've been using www.SMEstorage.com for this. They support multiple storage clouds as back ends, and have DropBox style tools that give me automated sync between multiple machines (and mobiles). Keeping all of my 'work' data safe and in sync between my desktop and laptop is costing me cents a month.