You can always do what I do. I have two desktops and a notebook, and have duplicate drives for all of them. I use Acronis TrueImage7 (Just got an update patch, BTW) to clone them - i.e., the complete drive. Then disconnect them. I clone them all about every 10 days two two weeks, or whenever significant changes occur.
It's a pretty simple process using the bootable CD created by TI7 To restore, I simply change drives by turning one off and the other on (Switched mobile racks.)