Selfhosted
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Two good points here OP. Type
docker image lsto see all the images you currently have locally - you'll possibly be surprised how many. All the ones tagged<none>are old versions.If you're already using github, it includes an package repository you could push retagged images to, or for more self-hosty, a local instance of Forgejo would be a good option.
I'd also like to add that you can save an image to a local file using
docker image saveand load them back usingdocker image load. So, along with the options mentioned above, you have plenty of options to backup images for offline use.