In case of FaceStation2, BioStation2 and BioStation A2 can export/import log & user data via USB port.

On FW before 2018, it was provided as a folder but on FW since 2018, it provides .tgz compression format. (BioStar2_yyyymmdd_xxxxx.tgz)
You can check this log directly using the SDK USBControl sample.
As shown in the figure below, you need to specify the Path to the folder above the Log folder.

But this export file wouldn't export image log.