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if there are some custom image, e.g. additional stuff I added to an existing image, then I backup the dockerfile. you can rebuild the image anytime and the size is smaller than a binary.
Came here to say that: the most economic solution is to backup any dockerfiles themselves, though that also has the caveat that any installs within the build steps might also depend on external resources that could also be dropped.
There are methods of adding a local caching layer between your system and external, which might be what OP is after, but that involves investing in the additional space needed to back them up
good point, I might do that over the weekend :D