Developer website: NTI
Real-time and continuous data backup plus you can set Shadow 4 to save versions of your files/folders every time they change. You can also specify your backup schedule by the minute, hour, day, week and start time(s) and choose a specific or even a customized file type with Shadow 4 advanced file filtering.
Shadow 4 delivers the ability to automatically copy files from multiple Macs to various devices in real time and also preserves the files in their native format - meaning no additional software is necessary to restore files. Shadow 4 works transparently in the background silently keeping your files protected.