How can I save my docker image without 'docker save'?

Due to network limits, I have been committing my docker image offline in my own PC these years. Today I suddenly get into a situation that I’m not able to conduct any command in the previous system. I can only copy files from the disk by using a temporal ubuntu install disk. Can I just copy /var/lib/docker to a new system and just recovery my images safely?

Please help me, I really need my images!