Thanks for reaching out to us in the Community.
When exporting and importing company data files from QuickBooks Desktop (QBDT) to QuickBooks Online (QBO), changes will impossibly happen with the data. Yes, you're right. We can create a backup of your QBDT company data before migration. Doing so will help you save your data and supporting files.
If your QBO version is updated, we can seamlessly migrate your QBDT company file to QBO so you can start working on the new platform in January.
If otherwise, we can manually export and import the created backup file to QBO. Also, if your company file exceeds 750,000 targets, we're unable to move it to the Online version. That said, I suggest condensing the file to reduce its size.
After successfully migrating your data, you can check out this article to keep track of your financials in QuickBooks: What to do after you move from QBDT for Windows or Mac to QBO.
Furthermore, I've added these articles to help you understand what data is exported and how to resolve errors when migrating from the desktop to the online version:
Let me know if you have more queries about migrating from QBDT to QBO. I'd be glad to assist you. Take care!
