How to copy folder and files to external drive by Hybrid Backup Sync 3
Procedure
1. Please make sure the external drive can be seen in File Station first.
2. Open Hybrid Back Sync 3 and find Sync > One-Way Sync Job
3.Select Local NAS
4. Add a paired folder
5.Select the source folder
6.Select the destination folder on External Devices
7. Selecting the folders, and press Next
Set the Job schedule
Rules
Create the job
Sync Now
The Result
If you meet error after syncing,
Please help to open a ticket by QNAP Service Portal
And share us the screenshots of what you see and collect the Debug report. 
Related Links:
How to rename an external USB drive
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