You can cancel your subscription, and your data will eventually be archived, Caroline.
To permanently delete your QuickBooks Online account, you must cancel its subscriptions. After canceling, you can access your data in read-only mode for one year before it's deleted. If you're on a free trial, your data stays available for 90 days after the trial ends.
It's recommended to export your data before canceling to keep it for future use.
If you haven't canceled your subscription, follow the steps below:
Click the Gear icon, then select Billing and Subscription.
Select Cancel subscription or Cancel online from the QuickBooks section.
Once completed, you receive an email notification containing the cancellation details.
On the other hand, you have the option to submit a request for data deletion. You can log in to your Intuit account to delete your data from the servers.