So I have VMWare fusion and Windows XP on it...I have read to exclude the virtual machine from time machine backup as any changes made in the virtual machine will cause time machine to recopy the entire thing all over again. So...I was thinking could I just copy the vmware file into a partition on the external hard drive and periodically replace the vmware file in order to update the settings and changes etc. So if worst comes to worst and have to reinstall fusion I could just open the file from the drive and I wouldn't have to reinstall windows etc? Would that work??