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[[_prep_migration]]
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== Preparing for upgrading
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Before you upgrade, be aware of the order in which you need to perform the upgrade steps. In particular, be sure to upgrade {project_name} server before you upgrade the adapters.
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[WARNING]
====
In a minor upgrade of {project_name}, all user sessions are lost. After the upgrade, all users will have to log in again.
====
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.Procedure
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. Back up the old installation (configuration, themes, and so on).
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. Back up the database using instructions in the documentation for your relational
database.
. Upgrade the {project_name} server.
+
The database will no longer be compatible with the old server after the upgrade.
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. If you need to revert the upgrade, first restore the old installation, and then restore the database from the backup copy.
. Upgrade the adapters.
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