Originally Posted by jonathan g
What you're describing is updating the operating system, not Zimbra. My guess is that you're running the operating system Fedora Core for your Zimbra install.
You should always be careful on doing updates of the operating system with a production server, unless you have an easy way to roll back those updates if something breaks.
But, to answer your question, what you've posted seems to be accurate.
Ben Franklin quote:
"Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety."