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Is it possible to keep backup of docker images?

Here is my docker image:

my@onl-dev:~$ docker images
REPOSITORY                   TAG                 IMAGE ID            CREATED             SIZE
centdemo                     latest              e0b0d89f6c45        2 days ago          3.322 GB

I have some data in this docker image which I copy from container to host whenever needed. 

root@onl-dev:/distros/centos6.6.x86_64# docker cp 9512b894d107:/distros/centos6.6.x86_64 /data/sept15/mess

So I want to keep backup of this docker image such that I can restore it whenever I want to copy the data from container to host.

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1 Answer 1

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You can simply tag the image with different tag

docker tag <image-name>:latest <image-name>:backup

Nonetheless you can always use the image ID: e0b0d89f6c45

Another option is to store it in a tar.

docker save mynewimage > /tmp/mynewimage.tar
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