Setting up a cloud "backup" system

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http://serverfault.com – So, here's my situation: We have a file server here at the office that is used to store all of our documents, with nothing being stored on the local machines. Pretty standard, and for the most part, this works well enough. However, we have some users who have laptops, and want to be able to access files while off-site without having to copy them to their hard drives. We are using Office 365 for our email, so what I have set up at the moment is a SharePoint Online site that they can access via a network place in Windows. SharePoint Online has no built-in file synchronization method, so I am (HowTos)