Taking whole backup of your Jira, if not already configured as a service is probably the best way to do it. It will ensure all the configurations and data are backed up, of course for whole instance. It is also possible to restore individual project from the backup which only works when all the required configurations are already there in your instance.
This is of course the xml backup of Jira instance. Ideally you should also have backup policy for your database and file system.
You can also export individual project issues to csv.
Update: https://community.atlassian.com/t5/Atlassian-Cloud-Migration/Data-Residency-Comes-to-Australia-amp-Update-on-Data-Residency/ba-p/1825538 We have just released data residency for Austra...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events