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I wrote "hashcache" [0] [1] for this for my Linux distribution (which is the build from source variety) to avoid issues with upstream going away, or worse changing the contents of a file.

Many different caches can be used, in case one is down as well.

Simple example download script at [2].

[0] http://hashcache.rkeene.org/ [1] https://chiselapp.com/user/rkeene/repository/hashcache/ [2] https://kitcreator.rkeene.org/fossil/artifact/d546c4b48dfce8...

https://wiki.debian.org/AptCacherNg still exists and still works fine.

Aptly [0] is also really nice for maintaining mirrors and one's own Apt repositories though it is unmaintained.

[0]: https://github.com/aptly-dev/aptly

Not caching... mirroring or vendoring.