Most syncing and clone utilities for Mac have not really been updated in recent years.
We believe that the Mac deserves better, so SmartBackup 4 received a completely redesigned interface and a new synchronization mechanism using the latest technologies.

SmartBackup will copy several files at the same time, which is the only way to use the full performance of SSDs and Flash drives, which are now common in modern Mac computers or optimize the bandwidth of the NAS.
Additionally:
Ultra-fast synchronization and cloning

SmartBackup is an easy-to-use utility for ...
Synchronize files and folders with the recipient
Create a bootable clone of your macOS
Fast data migration or re-backup
It uses a custom modern synchronization mechanism, which ...
Automatically copies only changed
Archives of versions of modified or deleted files
Can exclude items from synchronization
Scheduling synchronization and backup from the application.

Requirements: OS X 10.10 +

Home Page - http://solesignal.com/smartbackup4/