Hi nks, the WD My Passport Ultra is a very good option - it is very compact and light, available in a capacity of 2 TB and four color options and has a USB 3.0 socket, which will work with USB 2.0 connections too.
It has pasword protection and hardware encryption to protect your data.
The hard drive also comes with the WD backup software - WD SmartWare Pro, which will allow you to make back-ups at certain times.
For further info you can check the WD website - *www.wdc.com/en/products/products.aspx?id=1000
Hope this helps.
Cheers, Dorian_WD