If you want to copy an object in the Extbase extension of typo3, you can use the following code to achieve the same.
public function copyAction(\VENDOR\Ext\Domain\Model\Object $object)
{
// create new object
$newObject = $this->objectManager->get("VENDOR\\Ext\\Domain\\Model\\Object") ;
$properties = ObjectAccess::getGettableProperties($object);
foreach ($properties as $propertyName => $propertyValue) {
ObjectAccess::setProperty($newObject, $propertyName, $propertyValue);
}
$newObject->setPage($newPages);
// add the object
$this->objectRepository->add($newObject);
}