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Ask the backup file (QBB) from your old bookkeeper. Then you or your new bookkeeper will restore it on the trial license of QB 2020.
Once you can restore it without any issue, you may migrate it to QBO.
We can easily move your QuickBooks Desktop data to QuickBooks Online, jcochranwsu.
Before we proceed to the conversion process, there are a few things we need to prepare:
After that, we're ready to convert your file. You can follow the detailed steps through this link: Move your QuickBooks Desktop file to QuickBooks Online.
Then, you can run reports on both platforms (Desktop and Online) to compare the data.
Feel free to drop by if you need additional assistance with the process. Have a great day!