Do we have any best practices for migration from one Jira Align instance to another Jira Align instance; pls. share.
I would encourage you to raise a ticket with Atlassian support to allow them to move the db for use.
The export, import functionality of work items does not capture all the data required and does not include the custom terminology, portfolio, programs etc.
You may want to do copy your production Jira Align instance to test for example.
To do otherwise will result in less than desirable results and or a TON of manual work. i.e the configuration (platform, Roles, etc) is not able to be moved via export/import. When you export/import work objects (Epics, Feature, Stories, etc) the history is lost/not imported. Some work items or tracking are simply not available to move any way other than the DB restore (simplifying) that Atlassian ONLY is able to do.
I believe the team does these refreshes once a month. I would recommend putting your request in a month before you want to refresh.
This is the same process to be followed if you want your JA test instance refreshed from Production - You are provided a distinct number of those per year with your purchase of the software.
Reach out to your TAM or Premier Support team member for more information on the number available to you.