BestSync is a tool to synchronize, back up, encrypt, compress between folders, removable media, FTP server in following scenarios: folder1-folder2 mirroring; PC-FTP Server (in different time zone); PC1-removable media-PC2 with password-protected 128-bit encryption. BestSync provides: fast file filtering, only designated file types and changed files are transferred; An exclusion engine to exclude designated sub-folders and files; opened/locked file backup function to backup database file, mail file; run as windows service without user logon; file change monitoring feature to sync file as soon as it is changed; flexible and powerful scheduler to start task automatically; preview to modify hit files and synchronization direction; compare tools to view difference of files and versions; log view to restore backup file easily; Windows Shell Extension to encrypt or decrypt folder conveniently. Version 2.8.2.1 fixes a bug that if only the tasks of monitoring file change are set, Bestsync service can not be started.