The size of your backup will be identical to the partition capacity (not used) – so plan ahead! You will want to take an image of your BOOTCAMP partition. You will need enough space to backup all the files so double check you have enough disk space in the location you plan to save this backup. First, open up Disk Utility in your original Mac with a Boot Camp partition. I tested this process on macOS Sierra 10.12.3. I do not wish to be held responsible for any loss and, while this procedure worked for me, I never claim to be an expert at anything unless I am getting paid.
We will use open source and other utilities already installed on your mac – dd, hdiutil, and Disk Utility. If you want to move your Windows 10 Boot Camp partition from one Mac to another, or simply to make a backup, then I hope this guide will help you! Please start by taking backups of all your data – both Mac and your Windows installation – and store these backups some place safe while you work.
