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?
"Let me get this straight... in order to merge two SaaS accounts I need to migrate them to server installations, merge them, then migrate them back into the cloud?"
<-- right. AFAIK- you need to install server, and set it up, and then use it to migrate to.... Bzzzt! Non-starter for us. :( I can't tell if it's 'typical Atlassian'- but I can agree it's not a viable solution. I think they are working on Cloud to Cloud tools, but... Am still figuring this out myself.
To reiterate other user's comments above...
The solution proposed is:
"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. " <-- this is a non starter.
My company doesn't even have servers. We're on GSuite and AWS and Google Cloud Platform. We can NOT start setting up Windows Server on Azure or AWS, etc, so we can figure out how to install and configure JIRA Server, so we can then attempt a migration from JIRA Cloud SaaS to Jira Cloud SaaS.
I can understand if it's a migration process that is not yet supported, fine. But we all kind of have to call BS on passing-through-JIRA-server being considered a realistic 'workaround'.