Once a Doll's neural cloud data has been backed up in Oasis, the Doll will never truly "die." Even if their neural cloud is destroyed, it can still be reset using the backup, thus resurrecting the Doll. However, a neural reset does not preserve the Doll's memories and past experience, so a reset Doll will return to his or her "factory settings."
Apart from Dolls, neural reset can also be carried out on other Agents in Magrasea using the data backup in their sectors.