ChronoSync is described as 'Can synchronize, backup, and create bootable backups to almost anything you can connect to your Mac: select cloud services, other Macs, NAS drives, external drives, PC's or anything you can mount as a volume' and is a File Sync tool in the backup & sync category. There are more than 50 alternatives to ChronoSync for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best ChronoSync alternative is FreeFileSync, which is both free and Open Source. Other great apps like ChronoSync are Duplicati, rsync, Acronis True Image and EaseUS Partition Master.