You will find the page “Snapshots of Config” under the “Common” tab.

You then click “create snapshot”

Your snapshot will then show in the list

These snapshots can be found in the home folder of your Atlassian server, under kerberos_snapshots

You may move this to a new server instance, and add it under a directory with the exact name kerberos_snapshots.
Please let me know if there is anything else I can help you with.