Google Docs recently upgraded to allow you to upload any file to Google Docs. This very handy feature means, if you purchase a little extra storage from Google, you can use Google Docs as your personal online backup service. Google offer a variety of storage plans:
From what I remember when I looked in to it, these prices are pretty good compared to dedicated online backup services (though anyone who needs and can afford the 16TB option needs their head examined!). The only issue is how to get all your files into Google Docs. Well, if your Command Line-Fu is strong, you could use Google CL, but it doesn’t work with a batch of files, unless you write some cunning script. A much easier alternative is to use software from Gladinet, in particular their Gladinet Cloud Desktop tool. 
This allows you to define various backup tasks, allowing you to sync folders and their subfolders to a folder in Google Docs (or Picasa or a number of other online sources). All your folders and subfolders are backed up to Google Docs, with the folder structure being replicated in Google Docs. You can set these tasks to run every day and it should only update new and changed files. I have been using it for the past month or so and it seems to work fairly well. The only real issue is due to slow upload speeds, but I am not sure whether this is an issue with my broadband provider or a limitation of the Google Docs servers. Either way, the results are that all my files are backed up to Google Docs automatically.
Hello.
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thank you.
Ok dokey my man, done.
I had to deal with Gladinet Pro (i.e. the paid version) on multiple computers within the past few months … I was tasked with supporting it when it was selected without adequate testing as a method for integrating Google Docs and the desktop for corporate customers.
Without writing a novella, I will simply say that Gladinet features decidedly ungraceful failure modes. The cardinal sin of any such backup software, i.e. data loss, frequently occurred. Tech support, whether by e-mail or by forum, was also just terrible. They are talkative, but very little gets done. None of the problems were ever resolved, and many potential pitfalls that even experienced users might suffer are not reflected in any of their documentation.
Put simply, do not rely on it. You’ll want to be certain you have additional local backups of the data, which is always good policy, and make sure that the files uploaded are actually there and usable, rather than Gladinet simply reading you back the cached files which do not actually exist on Docs except in filename only.