I'm at iOS 3.2.2 I'm about to do the 4.2 upgrade. I'm not jailbroken I'd like to back things up and set up so I can restore/downgrade from 4.2 if there's problems etc. my Google Fu has failed me. I've been unable to find any clear instructions on how to do this. (make the back up, and restore from it). I've seen things about blobs and so forth, but no idea what that means. Can anyone help, point me to a good link, anything?