Sunnyjohn,
If you want something a little bit different, try a
TouchTech Duo.
That, fitted out with top of the range SSD drives a firewire cable sits in my laptop bag as my "on the road" backup device. No power cable needed as can generally be bus powered.
Larger second and third backup devices from alternative manufacturers sit at home and work respectively.
If you are using Lacie (or indeed any other form of backup device), make sure you keep the firmware up to date ! Some lacie models had a habit of going to sleep and preventing TimeMachine from working until someone pressed the power on button on the lacie again.... all fixed by a firmware update though.