High Quality Content by WIKIPEDIA articles! File synchronization (or 'syncing') in computing is the process of making sure that files in two or more locations are updated through certain rules. In one- way synchronization, also called mirroring, updates files are copied only from a 'source' location to a 'target' location, or locations, but no files are copied back to the source location. In two-way sync, updated files are copied in both directions, usually with the purpose of keeping the two locations identical to each other. The term synchronization is used in this article to mean exclusively two-way file synchronization. File synchronization is commonly used for home backups on external hard drives or updating for transport on USB flash drives. The automatic process prevents copying already identical files and thus can save considerable time from a manual copy, also being faster and less error prone. However this suffers from the limitation that the synchronized files have to physically fit in the portable drive.

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