How do I update quickbooks online before its disabled?

Can you elaborate your question? What update? What disabled?

Do you need to cancel your account and preserve your historical data?

It's nice having you in the Community, cmartin. I want to ensure we're on the same page in addressing your concern in QuickBooks Online (QBO). 

QBO is a cloud-based application where updates are automatically applied. Therefore, there's no need for us to manually update this with new features or functionalities implemented. However, can you elaborate further about what you're referring to when you say before it's disabled? Additional information is much appreciated.

Furthermore, here is an article you can check when exporting your data from the application. Doing so will allow you to save a backup file of your company: Export reports, lists, and other data from QuickBooks Online. 

I'll wait for your response to get this sorted out. Also, if you have additional questions about QuickBooks, please don't hesitate them to add to your reply. Have a good one!