I'm sure you'll be very surprised to hear that the top result on search engines is the standard documentation from Atlassian's site. https://confluence.atlassian.com/display/JIRA/Migrating+from+JIRA+Cloud+to+JIRA+Server
That is not what your question was about. You asked about migrating from Cloud to Server, and that my answer is correct for that. Your *new* question is about *merging* two Jira instances, which is a totally different thing. The broad overview of that is: * Migrate your data off Cloud and on to a temporary development system, as per the instructions for migration. You need to make sure that the development system is the same version of Jira as your target system * Export an xml backup from that system * Import the project(s) you need into the production system, using "project import" There are other routes, but we can't really advise you on them without more detail on what you really mean by "migrate" (because it's not migration, it's probably merging)
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