Mac log files: where they are and which are safe to delete
Old log files are safe to remove, but they rarely hold much space. Here is where they live and what to leave alone.
Guides to freeing up space on your Mac
What’s safe to remove, what isn’t, and how macOS storage works.
Articles, page 8
Time Machine local snapshots taking up space
Local snapshots are short-term copies of your disk's state. macOS releases them when it needs room. Here is how to list them, how they differ from backups and when to act.
Purgeable space on Mac, explained (and why you should not force it)
Purgeable space is data macOS can remove when it needs room. It is already counted as available. Here is what it holds and why you do not need to force it.
System Data grew 50 GB overnight: what happened
A sudden jump in System Data has a short list of causes: an update, a snapshot, a runaway log or cache, or one app. Here is how to tell which, using read-only checks.
macOS Sequoia System Data huge: causes and fixes
A huge System Data number on Sequoia has a handful of usual causes. Check them one by one, fix the safe ones, and leave the system's own files alone.
Old iPhone backups and iOS updates on your Mac: find and remove them
Check whether you have local backups, decide whether you still need them, and remove them through Finder rather than by dragging folders.