I have not been able to do any USB external disk backups from my EX 4100 since I upgraded to OS 5 several months ago. The external usb disks just do not appear in the usb list in the web interface. Therefore a back up job can not be created.
The EX4100 has been working well since i bought it, just one firmware update has given issues during the years. But now I wonder if I have to start looking for something else. Backups are critical.
Do anyone have a good idea what to do? Can the UPS connected have something to do with this?