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• The release notes for the version you are updating to and all intermediate versions.
• The general upgrade procedure.
• The specific pointsaspects.

If migrating from Magnolia 4.4/4.5, please have a look at the migration documentation first. You may also contact us for migration support. 

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1. Update to your latest minor release version first before upgrade to recent major release. A May 2017 example: a customer was considering an upgrade from 5.4.1 to 5.5.4 (latest release at that time). The correct sequence would have been: 5.4.1 → 5.4.12 → 5.5.4 instead of  5.4.1 → 5.5 → 5.5.4.
2. Carefully look for "change" or "changes for ..." sections in the release notes since.
3. Because the upgrade process takes time and is vulnerable to incidents, please minimize the risk by cleaning up your system, removing unused data, reindexing everything and doing a full backup first.

Specific

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aspects

Default JCR persistency layer in Magnolia 5.6

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