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The.dmg file is your backup - it contains your entire company file at the time the backup was made. Dmg is a Disk Image file - its a standard Apple file that is equivalent to a disk, like a CD. When you double click on it you 'open the disk' and you'll see it listed just like your hard drive is. Its a read only disk - you have to copy the.qb2014 company file out of it into your documents folder. Also the disk image may contain all your attachments if you are using those and backing them up. Drag that folder to your Documents folder, too, and then once you open your company file go into preferences-attachments and link it back to the restored attachment folder.
Here's why we use disk images: We deliberately made the 'CD' read-only because with previous systems users were opening their backups, entering transactions, and then later opening their real company files and saying the work was deleted by QuickBooks. The disk image also allows for the storage of all your attachments on the backup.
These aren't in the company file on either Mac or Windows (it would make the file much too large for transmitting to your accountant). A backup isn't a backup if it doesn't include all your data, including attachments. The disk image also is 'non-proprietary'. It isn't an Intuit file format - it is Apple's. Years from now you should still be able to open it and get at the data. Disk images are checksummed - they are verified valid before mounting. Its a very safe format.
Disk images are automatically compressed, again in a completely non-proprietary way. Finally the disk image allows you to specify AES encryption. It is a very secure format. The key can be stored automatically in your Mac keychain.
'This is not a valid Attached Documents Library' is the message you get when you try to select a folder for your attached documents that isn't an attached documents folder (ie. Its just a random folder). I assume you are using attached documents and backing them up and want to restore them (if that isn't what you are trying to do please spell it out in more detail).
Once you double click on the backup dmg to mount it you'll see a folder open on your desktop. Inside of that will be the backup of your QuickBooks company file and the backup of your Attachments folder. If you want to restore your company file you copy the QuickBooks company file onto your hard drive (default is to place it in your Documents folder). If you want to restore your Attachments you copy the Attachments directory from the disk image to your hard drive (again, the default is the Documents folder). If you want to restore both you copy both over. Then launch QuickBooks by double clicking on your newly restored Quickbooks company file in your Documents folder.
Your company file has the file extension.qb2015. Once it opens choose QuickBooks-Preferences. Then choose Attachments. You'll see a pop up menu asking you to locate your Attachments folder. Select it and navigate to the Attachments folder in your Documents directory.