Simply, file sync is to copy files to other places to keep it safe from data loss when accidents happen. For file sync software, it can not only sync files, but also many other items.
AOMEI Backupper is a professional and safe backup and restore third party tool. Importantly, it equips with “File Sync” feature which can sync most kinds of files but not limit to files in a few easy steps. With it, you can never worry about the security of your crucial data.