The present invention pertains to a medical gas supply system and a method for supplying a medical gas to a patient, preferably providing a backup system to ensure a continuous and safe medical gas supply to a patient. Accordingly, a medical gas supply system (1 ) for supplying a medical gas to a patient (7) is suggested, comprising a plurality of gas conduits (20) fluidly connected to at least a first medical gas source (2) and each having a gas outlet (22), a plurality of sensors (3), each in fluid communication with a respective gas outlet (22) and configured to detect at least one gas characteristic within the gas conduit (20) at the respective outlet (22), and a control unit (4), which is in communication with the plurality of sensors (3) to receive and process an information related to the at least one gas characteristic, wherein the system (1 ) furthermore comprises at least a second medical gas source (5) connected to at least one of the gas conduits (20) via a first control valve (50) in communication with the control unit (4), wherein the control unit (4) is configured to actuate the first control valve (50) based on the received information.
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