How to hide old Done tasks from the Board?

[Volha_Hedranovich]

Hi! Our Board contains too many Done tasks now. We'd like to hide most old tasks -  not to display them in the Board normally.

[Nic Brough -Adaptavist-]

Restore the database into an empty schema, then point a development JIRA at it.  You can then use the xml export facility to get an xml dump, from which you can import projects.

Trying to convert data from a plain database dump into something you can import is a massive amount of work, and error prone, not to be recommended.