If you ever wanted to backup documents stored inside of SharePoint with out really backing up content databases, I published PowerShell script to TechNet script repository site a while ago. If you are interested go download it from here http://gallery.technet.microsoft.com/scriptcenter/en-us/1b0dfae9-19d9-4c2e-9c0a-4f1ff99e484b

Cheers,

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