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The Mac App Store version runs in Apple’s App Sandbox, which only lets an app see folders you give it. Choose your home folder (the one with your name, containing Desktop, Documents and Library) and click Allow. Diskloft remembers it; you can revoke it in Settings → Access.

macOS protects Mail, Messages, Safari, the Trash and a few other folders. Open System Settings → Privacy & Security → Full Disk Access, turn on Diskloft, then scan again. Diskloft only measures these folders; it never removes mailboxes, messages or browser data.

To the Trash, unless you choose “Delete permanently” in the confirmation sheet. You can put items back from the Trash in Finder until you empty it.

Caches are data apps can rebuild, so clearing them is safe, but an app may be a little slower the first time it rebuilds them. Quit apps before clearing their caches for the cleanest result. Diskloft empties the Caches folder itself but keeps the folder.

Diskloft frees disk space. A nearly full disk can slow macOS down, so making room can help, but Diskloft doesn’t claim to speed up your Mac otherwise.

No. Diskloft only works inside your home folder and refuses system locations, your keychains, preferences, mailboxes and the main folders themselves (Documents, Desktop, Library…). Every path is checked again right before anything is removed.

Files with the same size are compared by their full contents with SHA-256. Diskloft keeps the oldest copy by default and never lets you select every copy of a file.