I would like to ensure a smooth upgrade to 5.0.2. I am currently on 4.5.6 on Ubuntu 6.06LTS . I am a linux newbie and mail server newbie so mercy. My plan is to backup the Zimbra dir to another drive first for safety . What commands would tar(zip)it . Install 4.5.11. check everything if its good then on to 5.0.2. . Is it simply a matter of stopping zimbra and running the install for each upgrade version . Discounting the backup how long should each install take?