How can I verify that the data file is intact.?Like in Sage you go to Data Integrity.is there a similar function?

Hi there,

QuickBooks Online uses the cloud platform to store its data. Our priority is to make sure we're using the latest technology that's secure, reliable and cutting edge. 

With the cloud platform, you can access your data from anywhere and at any time as long as you have good internet connection. If you run into any issues with your account, you're more than welcome to reach out to our customer support experts for help. Let me know if you have further questions, I'll be happy to assist you. :)