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Thank you for contacting us about this.
From my understanding, you're either trying to migrate the data to a new Confluence site, or you want to merge two Confluence sites together. Is that right?
I see you raised the same question in support, where my colleague explained to you the process to merge:
Merge 2 Confluence instance
Source Confluence: instance A
Destination Confluence: instance B
Export all spaces individually from instance A. Ensure that all the exported space's space keys are not overlapping with any in instance B. Confluence will not allow the import if the space key already exists in the instance.
Import the space backups individually that were generated from instance A into instance B
Once the import is completed, create the users accounts from instance A to instance B. If all the users in instance A are synced from an external user directory, then you can proceed by adding the user directory to instance B and sync all of the users. Please ensure that there are no users in instances A and B that share the same username.
Once all users are synced, the merge is consider completed. We suggest that you to first perform this on a test instance before performing it on the production instance to avoid any business impact.
See Create a Staging Environment in Confluence for details on how to create a test instance.
If you simply want to migrate Confluence and replace all of the data on instance B, then see Migrating Confluence Between Servers.
I have a similar situation where our Engineering team wiki spaces (only) is trying to migrate all their data as exactly appears from the original company Wiki (A) to the other confluence site. Basically transferring and adding this Wiki space of the Engineering team to another confluence site (B) that's currently in use by another satellite office of my company.
What data files need to be backed up?
What are the steps involved to transfer all data to the other confluence site?
Please advise. Thanks!