Model: My Cloud Pro PR4100
Firmware Version : 2.21.126
While using the “Copy” method of “Internal Backups” to move files and folders from one share to another, I discovered a bug which causes certain sub-folders to be omitted from the target. The file counts were accurate, and further testing revealed that it only seems to affect empty folders.
I was hoping that I had finally found a reliable backup solution, especially after two previous NAS backup solutions failed miserably, but it seems I have no choice but to use the network and my computer to ensure that backups are in fact exact copies of the source.
Here is an actual example of a test I performed and it’s corresponding result. There were no errors and the system logs do not show any indication of problems.
This bug may also affect other backup methods, but I have not had time to test them.