Firstly there is no upgrade path from Vista Home Premium to W7 Profesional, therefore you would need to either buy a full version of W7 Profesional, or buy the W7 Ultimate upgrade, in order to get the extras in W7 Profesional.
There is no way to backup Office 2007 or any other version, you need the Office instalation disk when doing a clean install of the OS.
Thanks fo r the info. Very much appreciated!!