If you want to save just the OCs, you can place the OC you'd like to copy in the extra slots, get another character you'd like to replace (a character you do not use, like the default boy), press copy all then click on your character that's in the extra slot. If you want to transfer them to another device, save it on apps meant for socializing such as Discord, Keybase, where you can copy the text on another device and do offline import.