Currently, when you duplicate a mod profile, all the actual mods (.jar files) get copied as well -- which is a waste of space since you don't need them installed twice.

Here's what I propose: Store all downloaded mods (and custom .jar files) in a folder managed by the CurseForge app. Then, when you add a mod to a modpack, simply make a hard link or symlink to "reference" the mod without copying over the data. The operating system still treats the data as being present in the modpack's mods folder, and therefore so should MineCraft.

This makes it so duplicating modpacks doesn't eat up your storage crazy fast.

Note to devs:
* symlinks require Admin perms. hard links do not
* symlinks work across drivers. hard links do not
* hard links and symlinks work on both Windows and Linux, so no compatibility issues (although the syscall api may differ)

While this idea is mainly focused for Minecraft modpacks, this should also work for other games.