Endpoint Protection

This may be a dumb question.  (a little paranoia on my part.)  By selecting Maintain existing client features I'm assuming this will only update the components that the client already has installed and not install additional modules.  (i.e. if the server only has AV installed the assigned installer will only update the AV.)  Can someone please confirm?  (Updating 11.x client to 12.1.4 from SEPM running 12.1.4)

Yes only AV feature are upgrade no any feature installed

Correct. If you add any though they will also get installed.

For reference:

Add or remove features to existing Endpoint Protection clients

I typically uncheck this though and add the feature sets I created on the Install Packages tab, just to make me feel warm and fuzzy.

100 right% :) all the best for the upgrade

Hi,

Thank you for posting in Symantec community.

I would be glad to answer your query.

I would recommend to uncheck that option SEP 12.1 has many new enhancements compare to SEP 11.SEP 12.1’s Insight technology is particularly effective against the very latest threats for which no AntiVirus signatures yet exist. Unless there is a compelling reason to, each of these additional components should be deployed throughout the organization.

SEP 12.1 RU5 is the latest version of SEP. 

To know the best practice I would recommend to go through the following article.

https://www-secure.symantec.com/connect/articles/sep-11x-sep-121-upgrade-process-graphical-overview

Important note: The SEP 12.1 SEPM upgrade installer requires three times the current database size (sem5.db) if upgrading from pre-12.1 SEPM with the embedded database only.