I am trying to enable auto-backup on my OC200 controller. It is PoE powered (TP-Link TL-POE160S) and has a working 4GB USB Key (NTFS formatted) in the USB port. I've tried rebooting etc, but I still see the Auto Backup toggle greyed out, and a message telling me I have to have PoE power and a storage device attached.
I have also tried formatting the USB Key with FAT32 (makes no difference)
Is there something else I have to do? Are there specific USB key brands that are known to work?