[kubuntu] About Wubi Installed Kubuntu

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http://ubuntuforums.org – Hi there guys i have installed kubuntu using wubi installation. So i want to know is this installation is somehow different from original installation of kubuntu? And is there any problems regarding software installation upgrade etc? or this works fine?.. The problem i found in wubi installation is that i cannot backup my kubuntu.. if i backup the kubuntu drive. whole drive is backed up including the free space, and that take too much space. (Hardware)