Seperate /home on Virtual Installation

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http://askubuntu.com – I tried asking this in another forum, but didn't have any success. I am hoping someone here can help or at least offer some thoughts. I currently have Lubuntu 12.10 installed on my computer in a dual boot configuration with Win 7. I mostly access it by loading the Linux partition with a mapped vmdk in VirtualBox, but sometimes I do boot into it directly. I would like to move home to a separate partition. In order to back up this data along with the rest of my through Windows without a lot of fuss, I would like to have /home in a virtual disk. The problem is that when I boot directly into Lin (HowTos)