Using the symbolic link feature, it is possible to store the mod in one place and put the link in the modpack's "mods" folder. This way, if multiple modpacks are using the same mod (you can check if they are equal by hash, for example), there will be only one version of this mod and a few links, each in its modpack folder. This way, you will save space and won't need to download the same mod multiple times.
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