Please do it as the following steps:

1. Clicking ‘+ Add Backup’.
2. Select the ‘Local Copy’ or ‘Local Snapshot’, clicking ‘Next’.
3. Clicking ‘Unselect All’.
4. Go to ‘Customize Selection’, then select the backup files, clicking ‘Next’.
5. Clicking on the ‘Local Drive’, then select the external volume.
6. Complete all remaining steps to complete the backup.

Please refer to the following screenshot:

Thanks for your supporting of Nero!

Nero Support Team