Synchronize Pro X is specifically engineered for OS X, taking advantage of the modern properties of the operating system, such as pre-emptive multitasking, and supporting the full capabilities of the file system, including 255-character Unicode file names and OS X file permissions. Files are copied at the maximum speed possible, using pre-emptive multitasking to full advantage. It makes bootable backups of OS X system disks, without logging in as 'root'. "Fast scan" makes updating a bootable backup incredibly quick, and real-time folder watching starts backups when files are changed. Old files can be archived rather than deleted. The status of backups can be monitored and accessed from any web browser and email can be sent when backups happen, don't happen or have errors.
February 27, 2018
Version: Synchronize Pro X 6.8.6
Worked so long as you don't update it.
2yrs of free updates
Once your 2 years are up, be sure not to update the software. I did so and went looking to downgrade back to the version I could use (you get 2yrs of updates when you purchase) but it is not available and their support email responded with:
"We don't publish old versions of our software."