[{"Bold_text": "noun", "List Items": ["a person or thing that supports or reinforces another.", "a musician or singer or group of musicians or singers accompanying a soloist:a singer with a three-man backup that plays cello, bass, and guitar.", "an overflow or accumulation due to stoppage, malfunctioning, etc.:a sewage backup; a backup of cars at the tollbooth.", "a person, plan, device, etc., kept in reserve to serve as a substitute, if needed.", "Computers.a copy or duplicate version, especially of a file, program, or entire computer system, retained for use in the event that the original is in some way rendered unusable.a procedure to follow in such an event.", "a copy or duplicate version, especially of a file, program, or entire computer system, retained for use in the event that the original is in some way rendered unusable.", "a procedure to follow in such an event.", "Bowling.a ball that curves in a direction corresponding to the bowling hand of the bowler."]}, {"Bold_text": "adjective", "List Items": ["(of a person, plan, device, etc.) held in reserve as a substitute if needed:a backup driver; a backup generator.", "performing a secondary or supporting function:A drummer and guitarist are the singer's backup musicians."]}]