Bit Copier is a Free File Copier created by UtilityNerd. It can be used as a file backup tool to copy files, folders, or even complete drives bit by bit to another destination or location. Additional features and options include the ability to set buffer speed for same or different drive, copy empty folders, overwrite files, and to move files instead of copying.
Note: This tool is JAVA based, so you might want to use Portable JAVA.
Free Bit by Bit File Copying Software | Bit Copier
Authors Website: https://www.utilitynerd.com/software/bitcopier.html
Download: You can get this Free portable File Copier Here