This article describes how to make a backup of your company file in QuickBooks for Mac.
QuickBooks for Mac 2012 and Prior
Note: If you are using Mac OS 9 and backing up to CD, first save the backup to your desktop and then copy it to the CD.
Note: If you see Open rather than Save, click Cancel, then click the Backup icon again.
QuickBooks for Mac 2013 and later
Note: QuickBooks for Mac 2013 creates a .DMG file as a backup. Refer to this article for restoring this type of backup file.
If these steps do not resolve the issue, you can read discussions and post messages and questions relating to your issue on the Intuit QuickBooks Community site for free or you can contact a technical support agent for additional guidance. Fees may apply.