When you restore from a backup it replaces all data with just the data in the backup so you WILL LOSE everything entered AFTER the backup was created. The backup file full of data does NOT change when you restore. It remains exactly as it was and where it was - in case you need to restore again.
Thanks. But I'm confused. We're not backing up and restoring. Our CPA is just copying and sending the qbw file from the Intuit/QuickBooks/Company files folder on her hard drive and I'm putting it in the same folder on my computer. It worked seamlessly until we upgraded to 2019. When it works, it takes much less time than backing up and then restoring. It's also a much smaller file to transfer over the internet.