Bytesweep Where did my Mac storage go?
macOS tells you "System Data: 148 GB" and stops there. Bytesweep shows you the actual folders and files, then clears the ones that are safe to remove, with one-click undo.
14-day free trial, no card needed. Then $15 once for 3 computers. No subscription. Runs offline.
What "System Data" and "Other" actually contain
On macOS that bucket is mostly Time Machine local snapshots, Xcode DerivedData and device support files, iOS simulators, iPhone backups in MobileSync, Docker.raw, Homebrew and pip caches, and mail attachments. Bytesweep names each one, tells you how large it is, and lets you thin local snapshots with a single click.
Eight ways to look at the same disk
Treemap, Folders, Sunburst, Flame, Bubbles, Mind Map, Top Sizes and Age Map. A treemap makes big files obvious. The Age Map exposes the ten-year-old downloads you forgot. Every view drills down to the file and opens it in Finder.
Cleaning that you can undo
Safe Sweep collects only provably safe items: caches, logs, build outputs, trash, installers older than 30 days. Everything moves to a restore point on the same disk, so Undo puts it back in one click for seven days.
Bytesweep vs CleanMyMac, DaisyDisk and the rest
| Bytesweep | CleanMyMac | DaisyDisk | GrandPerspective | Finder Storage | |
|---|---|---|---|---|---|
| Price | $15 once | from $3.33/month | $9.99 once | Free | Built in |
| Payment model | One-time | Subscription | One-time | Open source | — |
| Malware scanning & updater | No | Yes | No | No | No |
| Visual views | 8 | 1 (Space Lens) | 1 sunburst | 1 treemap | 0 |
| Cleans junk automatically | Yes | Yes | No | No | Partly |
| Time Machine snapshot thinning | Yes | Yes | No | No | Partly |
| App leftovers & uninstaller | Yes | Yes | No | No | No |
| Duplicate + similar photo finder | Yes | Yes | No | No | No |
| One-click undo | Yes | No | No | No | No |
| Windows & Linux too | Yes | No | No | No | No |
Questions
Is it safe to delete System Data on a Mac?
Not as a whole, no. Parts of it are caches and snapshots that regenerate, and parts are files your apps need. Bytesweep separates the two, only sweeps the safe categories, and keeps a restore point so you can undo.
Does it work on Apple silicon?
Yes, on Apple silicon and Intel, macOS 12 and later.
Will it delete my iCloud files?
No. Bytesweep flags files inside iCloud Drive, OneDrive, Dropbox and Google Drive, shows which are online-only versus really on disk, and can evict a local copy back to the cloud instead of deleting it.
Or start the free 14-day trial first. Related: Mac, Windows, Linux, duplicates.