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Our default configuration does not use uses the server mode for H2. Therefore, if you If you migrate from Magnolia below 5.5.9 in the 5.5 branch or below 5.6.2 in the 5.6 branch and try to initiate a backup call using CLI or REST, it fails because H2 does not allow more than one connection at a time. This is a new issue in Magnolia (most likely due to H2 or Jackrabbit updates).A temporary workaround is to make H2 Configure H2 run in server mode and adding by adding AUTO_SERVER=TRUE in the URL parameters: 

<param name="url" value="jdbc:h2:${wsp.home}/db;AUTO_SERVER=TRUE" />

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