ZZ acts as the ultimate multi-domain back-up program. If you lose sites do to a cheap/bad host, you'll be able to restore your sites very easily and quickly, especially because you won't have any scipts to install.
Having one central Admin to manage all your domains is a realy great time-saver.
However, it is also easy to have everything wiped out.
Ask yourself: What happens if you build 50 domains using ZZ and The Newz Tuel and lose a hard drive?
Not only do you lose all your pages, you're also losing all your projects as well as all the pheeds you entered into the Newz Tuel.
Your webpages will still be up, but you won't be able to update them.
You need to back up Tuelz often. Just copy the entire directory containing all your tuelz to a secondary storage unit, like an external hard drive.
If you do this, you'll most likely be OK. If you don't, you'll most likely lose everything you've built sometime in the future.