For one of my project . am considering the following scenario to avoid power interrupt to my Ardunio UNO
i want to connect Arduino UNO with 12 V power adapter connected to Ac power and the on power jack
of Arduino to work when i have power from grid .
connecting a battery /Power bank to arduino USB to switch power when power from grid is OFF .
is it safe to connect both simultaneously to Arduino Board ?
Will this arrangement work as expected ?
Thanks for the support