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+Before You Upgrade
+==================
+
+Before you start your upgrade, there are a few important
+steps to take:
+
+#. Read the
+ `Release Notes <http://www.bugzilla.org/releases/>`_ of the version you're
+ upgrading to and all intermediate versions, particularly the "Notes for
+ Upgraders" sections, if present. They may make you aware of additional
+ considerations.
+
+#. Run the :ref:`sanity-check` on your installation. Attempt to fix all
+ warnings that the page produces before you start, or it's
+ possible that you may experience problems during your upgrade.
+
+#. Work out how to :ref:`back up <backups>` your Bugzilla entirely, and
+ how to restore from a backup if need be.
+
+Customized Bugzilla?
+--------------------
+
+If you have modified the code or templates of your Bugzilla,
+then upgrading requires a bit more thought and effort than the simple process
+below. See :ref:`template-method` for a discussion of the various methods of
+code customization that may have been used.
+
+The larger the jump you are trying to make, the more difficult it
+is going to be to upgrade if you have made local code customizations.
+Upgrading from 4.2 to 4.2.1 should be fairly painless even if
+you are heavily customized, but going from 2.18 to 4.2 is going
+to mean a fair bit of work re-writing your local changes to use
+the new files, logic, templates, etc. If you have done no local
+changes at all, however, then upgrading should be approximately
+the same amount of work regardless of how long it has been since
+your version was released.
+
+If you have made customizations, you should do the upgrade on a test system
+with the same configuration and make sure all your customizations still work.
+If not, port and test them so you have them ready to reapply once you do
+the upgrade for real.