i've read the first page and the guide but there's no clear answer to my questions, pardon if it's mentioned before, following are my questions:

1. can i back up to iTunes after jailbreaking? if so what is backed up? the non-jailbroken stuff? what will be restored when i do a clean wipe and restore?

2. if the above only backs up the non-jailbroken stuff, is there a way to back up all the jailbreak stuff and restore it when there's a new iOS update that can be jailbroken?