WereSync is described as 'Incrementally clones linux drives. WereSync can clone to a smaller drive, from a drive currently running, and creates new UUIDs, so the two drives can be used alongside each other' and is an app in the Backup & Sync category. There are seven alternatives to WereSync for a variety of platforms, including Mac, Windows, Android, iPhone and Linux. The best alternative is Clonezilla, which is both free and Open Source. Other great apps like WereSync are Acronis True Image (Paid), Carbon Copy Cloner (Paid), MiniTool ShadowMaker (Freemium) and SuperDuper! (Freemium).
Acronis True Image (or simply True Image) is a software product produced by Acronis that provides data protection including, backup, archive, access and recovery for Microsoft, macOS, iOS and Android operating systems.
Carbon Copy Cloner (CCC) features an interface designed to make the cloning and backup procedure very intuitive. In addition to general backup, CCC can also clone one hard drive to another, copying every single block or file to create an exact replica of your source hard drive.
MiniTool ShadowMaker is a backup software for Windows and provides enterprise-level backup. It backs up OS, individual files and folders, disks and partitions to storage devices for file protection with two methods - backup and sync; both support auto backup.
SuperDuper makes recovery painless, because it makes creating a fully bootable backup painless. Its incredibly clear, friendly interface is understandable, easy to use, and its built-in scheduler makes it trivial to back up automatically.