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Freecom FSG-3 Storage Gateway - Software Screen Shots
USB storage can be plugged in and shared and the appliance can also allow USB printers to be networked.
Updating the firmware gives you quotas so storage usage can be controlled on a per user basis.
You can keep an eye on internal temperatures and choose from three cooling modes.
The appliance can act as a VPN server but help for this topic is thin on the ground.
The bundled Acronis software can create and store hard disk images over the network to the appliance.