Umm, I dont quite get the question. A system backup, as in "da system" is not very usefull, only your data matters, ther rest is...secondary, really...
If you burn a CD/DVD of your home folder, you're basically set. Restoring to ***dows...is not needed, it's data, basically you'd put it anywhere the other system can reach out to it.
However, if you're faced with a restore issue on a regular base, consider RSYNC to a local server...but that may well be overkill for you.
By the way: welcome here. I saw that you've just signed up.;;