Install Ubuntu 11.10

[sinaphysics]

Hi,
I upgrade my ubuntu 11.04 to 11.10. in progress I just see this error "you have not enough space" and like this. what do you suggest?
If I want to install the ubuntu 11.10 by cd, how can I backup my ubuntu 11.10 and restore it on new 11.10 which i want to install it by CD?
extremely necessary

[Mark Phelps]

Did you do a Wubi install, that is, from inside MS Windows? Asking because the default space allocation for a Wubi install is very small -- often too small to allow for version upgrades.

[sinaphysics]

I'm amature one !
I had installed 11.04 through Vista windows. and few minutes ago i upgraded it to 11.10. Now i have free space error. Is it possible to backup anything and then i remove vista and install 11.10 by boot and then restore my backups ? i don't know include which folders in backup?