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.