Approach 2 is good, when the 3.3 webapp will start, if database schema was
changed it should be updated automatically - you just have to take care of
setting correctly the properties for this (see here :
http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Installation#HUpgrading…)
What is left is to report also any modification you would have done the the
properties (xwiki.cfg, hibernate hbm, ...), and to reimport the standard 3.3
xar. For import, you should be careful not to import the standard pages you
would have customized, or if you import them you will have to customize them
again.
Another approach would be to migrate your existing instance of 3.2 to 3.3,
and just perform a database backup previously, but of course it means
possible interruption of service.
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