Atlassian products have only had a "backup and restore solution" built into them for 17ish years.
Could you explain what you are looking for past the "backup" option in the admin menu?
Please check out these links for more details on how to take backup for Jira Cloud and also the storage limits:
How to create a backup for Jira Cloud
Data storage FAQ
You can also look at the following link to get details regarding automating Jira Cloud backup: https://confluence.atlassian.com/jirakb/how-to-automate-backups-for-jira-cloud-applications-779160659.html
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