Backup your Pi
Every now and then and especially once you’ve made a very useful change to your RPi (got your wifi USB adaptor working or made it autostart into LXDE etc) then I recommend creating a backup image of your whole SD card.
On windows, the easiest way is to connect your card to your PC and use Win32 Disk Imager in read mode.
e.g Insert SD card into your computer/Card Adaptor and run Win32 Disk Imager, click on browse icon and create a new file somewhere to save your image – then click Read and the program will do the rest. 🙂