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Upgrading and the configuration backup

Question asked by kilucas on Feb 2, 2010
Latest reply on Feb 2, 2010 by mrogers
The General Upgrade Process document on the wiki says:

Back up any configuration overrides from the <extension> directory.
Note: Do not copy the files. Copy only the override settings so that you will not overwrite the new extension files in the upgraded version.

Does this mean that I save all the configuration override files so that I can put them back afterwards.? Or does it mean that I have to find any specific changes I made to these files, copy these out, and make the same edits again to new copies of these files after an upgrade?

I haven't made many such changes, but I doubt I could find those that I have reliably. Or is there a clever way to compare the standard versions with any that may have been customised?

Many thanks