That local cache is often implemented as a drop-in replacement for the upstream package repository, and packages are still installed with the same package manager (yum,apt,pip,npm).
That local cache is often implemented as a drop-in replacement for the upstream package repository, and packages are still installed with the same package manager (yum,apt,pip,npm).
No, this is not always the case. Regulated industries pin their package versions and store those versions for pulling.