We currently have a number of Atlassian instances within our organization and we are planning a merger, there appears to be an easy way to import a Confluence space, however, the same functionality for JIRA is not clear.
The process to merge two or more Jira Cloud sites is not a simple process to follow. It's actually quite complex. I would recommend following the KB: https://confluence.atlassian.com/jirakb/how-to-merge-two-different-jira-cloud-applications-together-779160767.html
In short, you can use the project import features of jira server in order to import the projects into a single Jira instance. To do this you first have to migrate each Jira cloud site to an empty Jira server installation. From there you can generate a backup of one of these and use that Jira server XML backup to import the projects in that backup into the other Jira Server site. However there is also a lot of prep work that tends to have to happen on the destination Jira site before you can complete even a single project import. Naturally this can take a lot of time and effort to complete for several projects.
Because we know this is a complex process to follow, there are 3rd party plugins for Jira Server that can help with this merge process. I would recommend either:
Either one of these plugins can help make this process easier to restore the projects of one Jira site into another.
Once you have all the projects from one Jira site merged into the other, you can then take a backup of that Jira Server site and migrate it back to Jira Cloud.
I hope this helps.
This response only addresses Jira Cloud. What is the option/procedure for those who wish to merge two cloud instances that include Jira, Confluence, and Bitbucket? Also, even if there are individual procedures for backing up these services from one instances and restoring them into another, what happens to the links between them? E.g., if I have an issue in Jira with links to code in Bitbucket and pages in Confluence, what happens to those links when everything is imported to the new, common instance?
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