backup hboot + current rom is that possible?

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http://forum.xda-developers.com – Hi guys, Got a couple of questions for you all.. I have a HTC Desire with S-Off and Data++ as hboot. Now i read about JB roms and i want to try that, but now my problem JB works only with stock hboot or custom made one. How can i make a complete backup (hboot+nand) so i can try JB for a while and if i don't like it restore back from the backup. I have 4ext to make nand backups, so restoring a rom is no problem. the only problem i think is the hboot. (HowTos)