Have a time machine drive automatically disconnect itself after backup

Ive got a time machine hd (its actually a samsung external hd configured as a time machine) plugged into an external monitor at work, when i connect my laptop to the monitor via 1 usb and 1 thunderbolt i get connected to the time machine and it automatically backs up.

When i leave each day and want to take my laptop with me i used to just disconnect all the cable and go, but now because there is an HD attached i need to disconnect it first, before i remove the cable.

Is there a way to tell the time machine to auto disconnect itself after a daily backup or auto disconnect after each backup ?