Hi Piotr,
Sorry to hear about this problem, it looks like Jira is unable to create a database XML backup due to an installed plugin. There are a couple of different ways you could try to get past this problem.
One way would be to create a database backup using the native database tools. The steps to follow to do this will be different depending on what type/version of database you are using with Jira (MySQL, Postgresql, MS SQL, Oracle). Creating a clone of the Jira database using the native database backup utilities is a valid way to make sure that this data is maintained during this kind of migration. We mention this Backing up data in as well as the preferred method for creating database backups.
Alternative to this approach would be to attempt to isolate which particular plugin in Jira is causing this particular error. Taking a closer look at the $JIRAHOME/log/atlassian-jira.log and/or the $JIRAINSTALL/logs/catalina.out during the time in which this backup is attempting to be created might help us to understand which tables are being accessed when this error happens. Perhaps a stacktrace found there can help provide us some clues as to the responsible code class. If we can find the AO table name, then perhaps we can figure out by using a reference page such as List of Jira Server AO table names and vendors. It might be necessary to contact the plugin vendor in order to resolve this in a manner that maintains the data of that AO table.
I hope this helps.
Andy
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