I still dont get it
Once jailbroken return to iTunes and restore your backup from earlier. To do so, right click on your device name under the 'Devices' menu in the left panel of iTunes and click 'Restore From Backup...' then select the latest backup you created before. (restoring this backup will return all the content previously on your device, i.e. apps, photos, etc.)
Wasn't the backup taken before JB. If i restore it, why does it not remove JB?
Or, in other words, how is this procedure different from reversing JB?