Running out of disk space

We host images and probably have 12 years of images stored. I delete really old stuff from the Media gallery but it doesn't dent the space used.
The website has gone through some updates till we ended up with Xenforo but I have existing links for images. If I set directory permissions to 700 and the website still runs, it's safe to say that nothing in that directory is being used for the website correct?

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