Does a nandroid backup contain the hboot? If I restore a nandroid backup will it restore the hboot and the corresponding partition tables?

I'm on bravo-stock hboot now and I want to try the CM7 hboot. Will I be able to switch back to stock hboot just restoring a nandroid or do I need to flash the stock hboot first?
Generally speaking, no, ClockworkMod (and other custom recoveries) do not backup your bootloader. You can physically look at your backup directory to verify this, but I have never seen a custom recovery that included a bootloader in the backups. What you typically get is:


Boot partition
System partition
Data partition (also /sdcard/.android_secure depending on the recovery/version)
sdext (if you have it)
WiMAX partition (if you have it)


The general rule is to make sure you have the correct HBOOT version before you restore a nandroid backup, and you'd have to flash it separately.