Use the built in "backup and download". It gives you a full backup in a format ready to be loaded into another Jira system which you can just drop into a NAS with a script. You can run it every 48 hours.
You can find a script to automate it at https://confluence.atlassian.com/jirakb/how-to-automate-backups-for-jira-cloud-applications-779160659.html
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