When I first installed everything I need on Zorin OS, hard drive space was ~5.7 GB consumed.
I just installed Stacer and used it to clean up unnecessary files. Now I'm at 5.3 GB consumed space, and I was able to disable Braille Services and the Startup Sound, so the boot is a tiny bit faster.
You can find Stacer by going to System Tools > Software, then clicking the 'magnifying glass' search button at top-left of Software, and searching for Stacer.
