I accidentally changed an Epic, which was linked in thousands of issues, to a Task. This un-linked all of the Issues. Yes, major face-palm, I know.
Is there any way to restore the Epic Link to all of the Issues that previously had them?
Whilst this page refers directly to the current cloud offering the principles apply for all versions of JIRA. https://confluence.atlassian.com/cloud/add-ons-and-plugins-744721612.html
As previously stated on other questions v3.12 is no longer actively supported and you should be looking to move to a more recent version to remove all the security risks with running such an old version.
Please refer to https://confluence.atlassian.com/jira/backing-up-data-185729581.html for principles of backup and in particular https://confluence.atlassian.com/jira/important-directories-and-files-189891075.html for the different directories and files that should be backed up.
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