Voyagers computers cannot help run his photonic program, and cannot contain a usable backup of its image. The Doctor's entire program uses 50 million gigaquads ("Lifesigns" and "The Swarm" mention these limitations). The episode "Living Witness" depicts a future Delta Quadrant civilization building a museum around Voyager artifacts, including its redundant EMH photonic processor.
Voyagers computers cannot help run his photonic program and cannot contain a usable backup of its image. The Doctor's entire program uses 50 million gigaquads ("Lifesigns", and "The Swarm" mention these limitations). The episode "Living Witness" depicts a future Delta Quadrant civilization building a museum around Voyager artifacts, including its redundant EMH photonic processor.