Hi paul116,

I understand how important it is to be able to keep the data in QuickBooks Online based on the mandate by the government. It's at the moment QBO keeps your data for 12 months only to give storage to new accounts. 

You can either export the data right away for back up or re-subscribe the account before it reaches the 12 month mark. Or use a third party application to help you download the data.

Post again in the Community if you have further concerns. Have a great rest of the day.