Building the whole project vs. building specific parts

Hello all,
this might be a rather noob question, so please be kind :8}
We have a big project with plenty of images and big files in it; we were thinking of trigerring a builds for certain areas of the project instead of trigerring each and every time a build of the whole project.
My initial question is then, does that make any sense? Would it take a lot of time for TeamCity to 'copy' such a big project in order to begin a build?

Hope this makes sense,
would be truly grateful for any reply :)

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