QB Issue Resolution:

Starting in QB Mac 2013 backup files were saved as .dmg files. Double click the backup file you want to restore, it will mount (open) as a drive, drag the company file from the open .dmg file to documents>quickbooks, from QB use file open company and navigate to the file.

Resolution for Issue 'RESTORE A BACKUP IN QUICKBOOKS FOR MAC' available: Yes (Solved).
Source: Intuit Community forum.

RESTORE A BACKUP IN QUICKBOOKS FOR MAC: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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