How do I manually backup my quickbooks online?

Hi there, 

Glad to have you connect with us in the Community. QuickBooks offers the tools and resources that help make your accounting easier. I'll be happy to share more info and steer you in the right direction. 

The ability to back up QuickBooks Online is available on the Advanced subscription. If you'd like to proceed with backing up and you're already on the Advanced plan, here's an article that shows you how to: Back up and restore your QuickBooks Online Advanced Company. Otherwise, I recommend using a third-party app that assists you with backing up your file. You can search for these apps on our app store www.apps.com. 

Let me know if this info helps. I'll be a message away in case you need anything else.