How to purge Brew backups, remove unneeded files?

[Anhsirkz]

Output of brew config

HOMEBREW_VERSION: 4.6.9-10-g0264a1e
ORIGIN: https://github.com/Homebrew/brew
HEAD: 0264a1e2eec08473366aef976c792d12994412c9
Last commit: 3 hours ago
Branch: main
Core tap HEAD: 3874d1a6e9bc44c4034050af5ec629ffe0af66a4
Core tap last commit: 43 minutes ago
Core tap JSON: 05 Sep 11:18 UTC
Core cask tap JSON: 05 Sep 11:18 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_FORBID_PACKAGES_FROM_PATHS: set
HOMEBREW_MAKE_JOBS: 10
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 3.4.5 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.4.5/bin/ruby
CPU: deca-core 64-bit arm_firestorm_icestorm
Clang: 17.0.0 build 1700
Git: 2.51.0 => /opt/homebrew/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 15.6.1-arm64
CLT: 16.4.0.0.1.1747106510
Xcode: 16.4
Rosetta 2: false

Output of brew doctor

I'm not comfortable sharing which programs I use here in public.

Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Some installed casks are deprecated or disabled.
You should find replacements for the following casks:

Warning: Some installed formulae are deprecated or disabled.

Warning: You have the following deprecated, official taps tapped:
  Homebrew/homebrew-services

Warning: You have unlinked kegs in your Cellar.
Leaving kegs unlinked can lead to build-trouble and cause formulae that depend on
those kegs to fail to run properly once built. Run `brew link` on these:

Warning: You have uncommitted modifications to Homebrew/homebrew-core.
If this is a surprise to you, then you should stash these modifications.
Stashing returns Homebrew to a pristine state but can be undone
should you later need to do so for some reason.
  git -C "/opt/homebrew/Library/Taps/homebrew/homebrew-core" stash -u && git -C "/opt/homebrew/Library/Taps/homebrew/homebrew-core" clean -d -f

Uncommitted files:
`There are a lot of ruby files listed`

Description of issue

Currently I am facing the issue of my available disk drive space running low. I suspect Homebrew being the culprit as I do not have that much files saved on my system that could explain this.
The problem:
When I was uninstalling a program I noticed the following output: ==> Backing App 'xxx' up to '/opt/homebrew/Caskroom/xxx/1.2.3/xxx.app'.
The directory Caskroom does not contain this program or its files anymore.
I tried running brew cleanup and brew autoremove thus not able to remove the imagined gigabytes worth of old junk.

Do you have any ideas how I could find out what fills up my disk drive, if Homebrew wasn't the problem?
Thanks in advance for your time 👍🏻

[SMillerDev]

du -sh ~/* | sort -h will give you a sorted list of what is using disk space in your home directory. du -sh /* | sort -h will do the same for the whole disk.