How do I backup QB2019 to run with 1 license on either of two laptops where one is for primary use and the second is in case the primary breaks, is lost, or stolen?

I just purchased QB2019 for 1 license, 1 user for use on two laptops where one laptop is the primary and the other is a backup.   The primary upgraded my QB2009 company file without issues.  On the backup laptop, I tried to read both the generated Company QB2019 file and the generated backup file.  Both approaches on the backup laptop generate a user must be unique error.   How do I use QB 2019 to ensure this backup scenario works?  


To open your company file simultaneously on both machines you use the QuickBooks Server application.  This allows data entry from both machines but does require two user licenses (two individual licenses or a license with two or more users on it).

For what you want you ("round robin" or using a single machine at a time) don't user QuickBooks Server.  The best way in QuickBooks Mac 2019 is to use iCloudDrive sharing. This requires both machines to be logged into the same iCloud account.  Then place your company file in the iCloudDrive folder (or, if you have Document & Desktop sharing on in iCloud, just use your Documents folder).  Note that Document & Desktop sharing works really well for maintaining a backup computer as most everything is automatically copied to keep the two up to date with each other.  But it does require more iCloud Storage. 

Anyway - once you have the file shared in iCloud you can access it from either machine.  Only one can write to the file at a time.  If they both write to the file at the same time you'll get a conflict dialog and have to choose only one set of changes.  But in general just use one machine and the other will be updated. 

If the backup machine will be mostly sleeping you should Enable Power Nap in System Preferences->Energy Saver.  This will allow iCloud to update it even while it's asleep.

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