Settings & keep-time · Services and self-healing
What does the Data Parking row in Settings → Services mean?
Short answer: It shows the mover behind the Data Parking window: Moving files while a move is in progress, or Idle when it's ready. Individual moves are listed in the window's Moves panel.
It shows the local mover behind the Data Parking window, which moves folders between your Mac and your external drive. Moving files means a move is in progress; Idle means it's ready for the next one.
To see individual moves and their results, open the Data Parking window's Moves panel. More in moving folders.