1. Go to the Uru game folder C:\Program Files\Ubi Soft\Cyan Worlds\Uru.
2. Once inside the Uru folder you will find a folder that says "sav". This is the folder that contains the information about your avatars. Right click on the "sav" folder and then choose copy.
3. Go into your My Documents folder or whatever folder you would like to make the backup in and then up at the top of that window go to Edit, and then click on Paste. You will now have a copy of the sav folder in that location that you can use as a backup.