Hello there, @asti-liebrecht.
Once your client's QuickBooks Online account is deactivated, you're given a year of read-only access to get all the data you need from your company. Just login to your client's account and export their reports and lists. I can guide you on how to do it.
- Go to the Gear icon ⚙.
- Choose 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.
You can read through this article the step-by-step instructions: Export reports, lists, and other data from QuickBooks Online.
Also, I'm adding these articles to help you manage your clients' account:
Always feel free to leave a post below if you have other questions about managing your QuickBooks account. I'm always here to help.