[ubuntu] Nutty to Oneiric server upgrade risk factors

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http://ubuntuforums.org – I'm preparing to 'do-release-upgrade' on a Nutty box to upgrade to 11.10. I've googled around, and found this advice. The server mostly runs Apache (LAMP) web services, including some that I have installed independently of apt (Plone, bugzilla, civiCRM, WordPress). Besides doing a backup of all affected data, configuration and apt-independent software, are there any other known "risk factors" to keep in mind and prepare for? TIA! Kirk (Hardware)