QB Issue Resolution:

When you choose File->Back up… it should prompt you for the location you want to store the back up. You can navigate in there to another disk or whatever you like. That’s the “one time” backup function.

The automatic backup location is chosen in QuickBooks->Preferences. Click on the back up icon. There is a pop up menu showing the folder where your automatic backups are currently being stored. Select the pop up and choose “Other….” to change this location.

Resolution for Issue 'How do i back up co files to disk or other' available: Yes (Solved).
Source: Intuit Community forum.

How do i back up co files to disk or other: 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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