With the upgrading as the premise, I agree with option b as presented by Torvista. As with testing a new release, keeping the upgrade in a folder that can be a separate PHP from the current site.
I also use the
Mod List by swguy as a quick aid for helping with the upgraded database. Many times, old mod files or changes to the DB are forgotten and the Mod List will "complain" that it can't find a setting or show a setting that is not in configuration.
Just a little helpful extra way to find out someone once installed or partially removed a mod that wasn't remembered or documented.
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