If you're looking to back up your Jira site easily, you can use the Backup Projects for Jira app completely for free to automatically back up your Jira site. Configure the app with your details and simply have a scheduled backup at an interval.
Step 1:
- Download the app from the Atlassian Marketplace
Step 2:
- Navigate to your Manage Apps section of the app and click on "Unsubscribe" from the addon
Step 3:
- Configure the app as described on the documentation page
And that's all folks. You now have a scheduled cloud backup for your Jira site completely free.