Photron FAST Dock User Manual page 21

4. Remote Controller Operating Instructions
④ The save operation begins. While the data is being saved, the display
counts down in units of megabytes to show the remaining storage
capacity.
Press the [ENTER] key to cancel the operation.
⑤ The display returns to the [OTHERS] menu when the save operation has
completed.

All of the video data in the camera's memory is saved.
You cannot select which data to save.
11 FAST Drive/FAST Dock User's Manual