What you need to prepare:

Pavtube ByteCopy for Mac

An external BD drive

Step1. Start Pavtube ByteCopy for Mac

Start Pavtube ByteCopy for Mac, insert Blu ray disc to external BD drive if you want to import Blu ray  movie from disc. Then click "Load BD/DVD Disc" to import BD from external BD drive. Also you can load BD/DVD from folder, just click "File" menu or "Load BD/DVD" button, choose "Load BD/DVD folder" and browse to the VIDEO-TS or BDMV directory that contains souce movie. After that, click "Check All" to select all imported files.

Step 2.Click “Browse” button to specify where to locate the output MKV files.

Step 3: Click “MKV” button to start lossless Blu-ray to MKV backup on Mac.

When the bluray backup on mac is finished by Pavtube ByteCopy for Mac, you can click “Open” button to get the final output MKV files with all audio/subtitles tracks and chapters preserved.