Apps · Drive, safety and recovery
How does Storage Studio make sure a moved app copied correctly?
Short answer: It confirms the copy on your fast drive matches the original file for file and that the app is still intact and signed. If any check fails, it keeps the original and discards the copy.
Before it replaces anything, Storage Studio checks that the copy on your fast drive matches the original — every file present and identical — and that macOS still sees the app as intact and correctly signed. Only then does it put the shortcut in place.
If any check fails, it rolls back: the copy is discarded, the original is kept, and you're told "nothing was deleted — the original is safe". We don't publish every detail of the checks, but the promise is that an unverified copy never replaces your app.