The read-only access to your QuickBooks Online (QBO) account is good for one year after you cancel the subscription. If you wish to keep all your data after a year, I recommend exporting or printing them before canceling or within the given one year grace period.
Reports and lists are some of the main data that you want to export. Below are the instructions on how to do it:
Select the Gear icon and then Export Data.
On the Reports tab, set the date range.
Add or remove items from the Reports and Lists tabs by toggling the slider.
Click Export to Excel.
The following articles contain complete instruction on how to export data from QBO: