BestSync is described as 'utility for following solutions:' and is a File Sync tool in the backup & sync category. There are more than 50 alternatives to BestSync for a variety of platforms, including Windows, Mac, Linux, Android and Android Tablet. The best alternative is FreeFileSync, which is both free and Open Source. Other great apps like BestSync are Duplicati, rsync, GoodSync and SyncBack.
Duplicati is a backup client that securely stores encrypted, incremental, compressed backups on local storage, cloud storage services and remote file servers. The Duplicati project was inspired by Duplicity and had similar functionality until 2008.
DirSync Pro is a small, but powerful utility for file and folder synchronization. DirSync Pro can be used to synchronize the content of one or many folders recursively. Use DirSync Pro to easily synchronize files from your desktop PC to your USB-stick.