how can I make an exact copy (like migration) of my Ubuntu 12.10 (I installed it through Wubi) in a capable pendrive (like 32 gb)? That would be useful in future since I could also remove Wubi and keep my Ubuntu usable on other PCs.
And another question, if I do this, there is a possibility to upgrade in future without losing applications or data?
grub
on the USB, and then you could boot it from any computer* (*make sure you don't install a closed source graphics driver and then boot it on a computer with a different graphics card). – bcbc Jul 09 '13 at 20:21