I am implementing iterative precopy migration for containers (Docker, Podman) using the following commands:

sudo podman container checkpoint -R -e=”/home/rohan/Desktop/Precopy migration/checkpoints/cp1.tar.gz” source2

sleep 1
sudo podman container checkpoint -R –pre-checkpoint -e=”/home/rohan/Desktop/Precopy migration/checkpoints/predump1.tar.gz” source2

sleep 1

sudo podman container checkpoint -R -P -e=”/home/rohan/Desktop/Precopy migration/checkpoints/predump2.tar.gz” source2

sleep 1

sudo podman container checkpoint -R -P -e=”/home/rohan/Desktop/Precopy migration/checkpoints/predump3.tar.gz” source2

sleep 1

sudo podman container checkpoint –with-previous -R -e “/home/rohan/Desktop/Precopy migration/checkpoints/wpev3.tar.gz” source2

sleep 1

However, all the checkpoints are the same size (73.9 MB). I need the new checkpoints to capture only the dirty memory or changes since the last checkpoint or predump. What am I doing wrong?
(https://i.sstatic.net/M0uULNpB.png)