I can provide some insights about backing up and restoring data in QuickBooks Online, @Buck Tsai.
Know that the security of your data is our priority. That’s why QuickBooks Online automatically backs up your data with the same level of security that banks use. And since we update your records with every change, we're unable to restore your file to a previous point in time.
For more insights, please see this article: Do I need to back up my data with QuickBooks Online?.
Alternatively, To save a report or list, here's an article for your reference: Export reports, lists, and more.
Please come back here if you have other concerns. I'll keep an eye on your response. Have a good day!
