Q. What is File synchronization and how does it work?

file-folder-backup-300x232A. File synchronization (or syncing) in computing is the process of ensuring that computer files in two or more locations are updated via certain rules. In one-way file synchronization, also called mirroring, updated files are copied from a ‘source’ location to one or more ‘target’ locations, but no files are copied back to the source location. In two-way file synchronization, updated files are copied in both directions, usually with the purpose of keeping the two locations identical to each other. In this article, the term synchronization refers exclusively to two-way file synchronization.

File synchronization is commonly used for backups on external hard drives or updating for transport on USB flash drives. Bittorrent Sync and Dropbox are prominent products. The automatic process prevents copying already identical files and thus can be faster and save much time versus a manual copy, and is less error prone. However this suffers from the limit that the synchronized files must physically fit in the portable storage device. Synchronization software that only keeps a list of files and the changed files eliminates this problem (e.g. the “snapshot” feature in Beyond Compare or the “package” feature in Synchronize It!). It is especially useful for mobile workers, or others that work on multiple computers. Most sync software will use encryption for security, especially when synchronizing across the Internet and will also compress any data sent across a network to reduce traffic.

Consumer-grade file synchronization solutions are popular, however for business use, they create a concern of allowing corporate information to sprawl to unmanaged devices and cloud services which are uncontrolled by the organization.