QB Issue Resolution:

You can store backups there, and let QB rotate them = manage them for you.

Don’t use Windows to Copy. Use the QB program’s own Backup Routine.

Resolution for Issue 'Can QB Desktop 2017 backup my data file to a NAS? If not why not?' available: Yes (Solved).
Source: Intuit Community forum.

Can QB Desktop 2017 backup my data file to a NAS? If not why not?: 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.

Support for Backup routine
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Error Recovery for Backup routine [Canada]
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