What files are safe to delete on a Mac?

Caches, logs, downloaded packages and build trees: things your Mac or your tools will make again the next time they need them. Deleting one costs nothing except the seconds it takes to rebuild.

Should I delete my old files or move them to another drive?

For files you made or were sent, which nothing will recreate, moving them to another drive frees exactly the same space as deleting and loses nothing. Deleting is rarely the right answer for your own data.

Why is Application Support risky to clean on a Mac?

For many apps that folder is the data rather than a copy of it, and there is no telling a cache from the only copy of somebody’s work. The Photos library is similar: deleting it in Finder can lose photographs, so use Photos’ own Optimise Mac Storage instead.

Can RefreshYourMac’s scheduled clean delete my own files?

Only Safe for auto removal categories can be cleaned on a schedule. Backup recommended categories have no bulk clean at all, Protected ones have no delete, and even at the safe level the Trash is never emptied automatically.

The four safety levels, and what each one allows

The rating is what cleaning a category costs you, not how much it frees. It is not advice printed beside a button — it decides what the button is allowed to do.

Everything the scan finds carries one of these four, and the app behaves differently for each. A Backup recommended category has no bulk clean whatever you click; a Protected one has no delete at all. That is the point of rating them: a level that only changed the colour of a label would be decoration.

Level	What it means	How it is cleaned	For example
Safe for auto removal	Regenerates on its own. Nothing of value is lost.	Clean All Safe when you choose it, or a schedule you set. The only level a schedule may touch.	Application Caches, Xcode Derived Data, NPM Cache, Google Chrome Cache
Review before deleting	Costs a rebuild, a re-download or an app restart. Worth a look before you clean it.	Clean takes the category after a confirmation that says what it will cost.	Simulator Runtimes, Duplicate Files, Duplicate Pictures, Project Build Folders
Backup recommended	Your data. Move it to another drive, or pick items one at a time.	No bulk clean at all: you pick items one at a time, or move them to another drive.	iOS Backups, Xcode Archives, Codex Sessions & Plugins, old project checkouts
Protected	Cannot be deleted here. It shows you what to do instead.	Never removed, however you ask. Measured and reported, with what to do instead.	Photos Library, Application Support, macOS Temp Data, Chrome passwords and sign-ins

Safe for auto removal

Regenerates on its own. Nothing of value is lost.

Caches, logs, downloaded packages and build trees — things your Mac or your tools will simply make again the next time they need them. Cleaning one costs you nothing except the seconds it takes to rebuild.

This is the only level the scheduled clean may touch. Clean All Safe takes every category at this level in one go, and the automatic clean takes the ones you leave switched on. Even here the Trash is never emptied automatically: it is the undo for everything else.

Application Caches · Xcode Derived Data · NPM Cache · Google Chrome Cache

Review before deleting

Costs a rebuild, a re-download or an app restart. Worth a look before you clean it.

Nothing here is your data, and nothing here is gone for good — but it is not free either. Removing a simulator runtime means downloading several gigabytes again when you next need it; clearing a cache an app is holding open means restarting the app.

Clean takes the whole category after a confirmation that says what it will cost. The difference from the level above is the confirmation, and the expectation that you read it.

Simulator Runtimes · Duplicate Files · Duplicate Pictures · Project Build Folders

Backup recommended

Your data. Move it to another drive, or pick items one at a time.

Files you made or were sent, that nothing will recreate. There is no bulk clean at this level at all — the Clean button opens the list and hands the choice back to you, because the app has no way of knowing which of your own files you still want.

Deleting is rarely the right answer here, which is why the level is named after the other one: Move to… frees exactly the same space and loses nothing.

iOS Backups · Xcode Archives · Codex Sessions & Plugins · old project checkouts

Protected

Cannot be deleted here. It shows you what to do instead.

Measured, sized and reported — and the app will not remove it, however carefully you ask. These are the places where it cannot tell a cache from the only copy of somebody's work, and a category that cannot tell should not offer the button.

Your Photos library is one: deleting it in Finder can lose photographs, so the row points you at Photos' own Optimise Mac Storage instead. Application Support is another — for many apps that folder is the data rather than a copy of it.

Photos Library · Application Support · macOS Temp Data · Chrome passwords and sign-ins

Which rating each category gets, and what the app refuses to count at all, is on how it decides what is safe. The Safe for auto removal level is most of what clearing the cache means in practice. The four labels in under twenty seconds: how do I know what's safe to delete on my Mac? on YouTube.

	RefreshYourMac	CleanMyMac	MacKeeper
Pay once	$24.99	€119.95 on MacPaw’s store; $89.99 for CleanMyMac X on the Mac App Store	subscription only
Yearly	$14.99 a year, first 7 days free	$39.99/yr on the Mac App Store; €39.95/yr on MacPaw’s store	€71.40 for the first year, 1 Mac. Their page shows it against a €119.40 list price
Monthly	$1.99 a month	$9.99/mo	€10.95/mo
Account needed	No	Yes	Yes

The four safety levels