I'll share information about the data usage in QuickBooks Online.
There isn't any information to know the data usage if you log into your QuickBooks Online account on a browser. However, the QuickBook mobile app customers use about 5 MB of data per month. This varies based on the transactions entered into your account.
Depending on your subscription, you have a specific usage limit in QuickBooks Online. These limits apply to the number of billable users you can create in QuickBooks. Check out this article for more details: Learn about usage limits in QuickBooks Online.
I've also included this resource to learn more about the computer and browser requirements for the best QuickBooks experience: System requirements for QuickBooks Online.
Let me know if you have further questions or other QuickBooks concerns. I'll be here to help you.