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Our default configuration is not using the server mode and therefore if one tries to initiate a backup call via CLI or REST, it will be failing due to the fact that H2 doesn't allow more than one connection at a time. We didn't have this issue in Magnolia before but for some reason (most likely due to H2 or Jackrabbit updates) we experience it now.

A temporary workaround is to make H2 run in the server mode, by removing DB_CLOSE_ON_EXIT=FALSE from the value of the url parameters and adding AUTO_SERVER=TRUE :

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