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I would do a recovery boot, then do a Nandroid backup from there.

So put into crystal-clear, noob-type terms: do a UA hard root, turn off device, press Home and Power for a recovery boot, then run ROM Manager to do a Nandroid backup?
Crap, I'm rooted, booted into recovery (I think), and running ROM Manager, but I click "Flash ClockworkMod Recover" and select "HTC Hero (CMDA)" I get an error message.
Wait...hey, it worked! Third time was the charm.![]()
The easiest way I have found to do it is to, starting with the phone off, simultaneously hold the "down volume" rocker and the on button and keep them both depressed. The phone will go into the boot mode. From this point hit the Home key, and a menu will appear. One of those menu selections should be a Nandroid backup. You can make Nandroids as well as restore them from this menu. When you are done, hit the back arrow and select Boot Phone.
I think this way has some advantages over doing the back-up from ROM Manager.
I have done this and get the black screen with a phone, triangle, and a ! in the middle. anyone else get this?