It's great to see you in Community. Welcome! What a great question. I'm sure many other QuickBooks Online customers would like to know how to backup their data as well. I'd be happy to shed some light on this for you!
There is no need to worry about backing up your data at the end of the day, or at anytime. This is because QuickBooks Online automatically does this multiple times each day, with every change that is made. Follow this link to learn more about Intuit's data and security.
Feel free to reach back out with other questions. We would be glad to help!
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