What are some alternatives?
When comparing Copywhiz and microsoft.com SyncToy, you can also consider the following products
TeraCopy - TeraCopy is a compact program designed to copy and move files at the maximum possible speed, providing the user with a lot of features.
rsync - rsync is a software application for Unix which synchronizes files and directories from one location...
Robocopy - Robocopy is a free file copy tool that is included with the Microsoft Windows operating system. It allows one to construct complicated instructions to move, or copy files.
FreeFileSync - Download the latest FreeFileSync 10.4. FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
Ultracopier - SuperCopier replaces Windows explorer file copy and adds many features: Transfer resuming, transfer...
GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.