Skipped a major release in upgrade. Too late?

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The message isn't as bad because it didn't carry out any update on the database and data itself. So you can still do a backup:

  • save data/ and config/-folder
  • save database (see in the config/config.php which type of database and the associated credentials, for sqlite it's just a file in the data/-folder)

Here is a guide on what to do: https://central.owncloud.org/t/updates-between-multiple-major-versions-are-unsupported/815

The current version you have installed should be shown in config/config.php. And the version you accidentally tried to upgrade is in the file version.php.

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