I realised after posting this one that there was one further important thing I should mention in terms of device backup - backing up the /EFS folder in the system area of the device. The EFS folder contains lots of information vital to the functioning of the phone like the IMEI number, and bluetooth and WiFi MAC address. If you corrupt or otherwise damage EFS when you're busy modding your device you will have a serious problem on your hands, so let's avoid that shall we? Once you're Rooted get a file manager that can use your Root privileges to access the system directories of the phone - I recommend Root Explorer. Find the /EFS folder and copy it - copy it to the external SD, and ideally leave nothing to chance by also remotely backing it up with something like Dropbox or excellent newcomer Minus. http://minus.com/reoQte9