The significance of file synchronizing tools is: through simple actions to complete a large number of complex and repetitive, manual file/folder copying, moving operation. SyncToy is a free, easy-to-use, and full automatic file/folder synchronizer produced by Microsoft that supports multiple sync modes and command-line operation.

Iperius Backup is an automatic file, data backup freeware with flexible and powerful features, from Italy. It supports backup for multiple types of data (file/folder backup, drive imaging, database backup...), and various backup patterns (full backup, incremental backup... ) on all kinds of storage devices (USB hard drive, RDX drive, NAS, LTO/DAT tape drive, networked computer, cloud storage and FTP server).

GoodSync is a very famous, simple but user-friendly and reliable automatic file/folder backup/sync utility. It can quickly and automatically analyze, compare and then sync or backup your files/folders among a variety of local or online storage spaces on multiple devices or platforms.

Because of worrying about any losses of the computer hard drive's broken some day, we usually think of using Portable External Hard Drive to backup important files, just in case. But if it is using the Windows built-in "Copy/Paste" function to to this, that always needs a lot of time, especially when asking you to "overwrite" or not, very troublesome. So, is there a fast, simple, intelligent and free application to do this?