Moving folders · Safety and verification
Can Storage Studio accidentally move the same folder twice?
Short answer: No. A moved folder is a set of links to its copy on your drive, so Storage Studio recognises it everywhere and never moves it a second time. Turning that protection off in Settings → Rules asks first, and then copies the real files, never the links.
No. A folder Storage Studio has moved is a set of links to its copy on your drive, and moving links isn't moving your files — so a folder that has already been moved is recognised everywhere (Data Parking, Emergency Space and the automatic rules) and never moved a second time. A move is reported as finished only once its links really lead to your files.
The protection is a setting, Settings → Rules → Never move a folder that's already been moved, and it asks before you turn it off. With it off, moving an already-moved folder shows where its files are now and how much will be copied, and only Copy the real files goes ahead — it copies the real files (never the links), checks every one, and points your Mac at the new copy. Automatic moves never move these folders.