Duplicate files · Duplicates in cloud accounts
Does checking a cloud account for duplicates download my files?
Short answer: No. Storage Studio reads your file list and the content fingerprints the provider already keeps, and compares those, so no file content is downloaded. Where a service keeps no fingerprints, it tells you instead of downloading your files.
No. Most cloud services keep a content fingerprint for every file — a short code that is the same for identical files. Storage Studio reads the list of your files along with those fingerprints and compares them, so no file content is downloaded and online-only files stay online-only.
We don't publish the details of how the comparison works, but here's what it means for you: a cloud scan uses little data and very little of your Mac's effort, which is why it can run on battery. Where a service keeps no fingerprints, Storage Studio says so rather than downloading your files — see fingerprints.