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What is the difference between one-way and two-way sync?

In one-way sync, Sync Center copies files or other information from one location to another location, but no files are ever copied back to the first location. In two-way sync, Sync Center copies files in both directions, keeping both locations in sync with each other. Most sync partnerships are automatically set up to perform either one-way or two-way sync, although some sync partnerships let you choose. Here are some examples of each:

One-way sync. You might set up one-way sync for a portable music player where you instruct Sync Center to copy every new music file from your computer to the music player but never to copy music files in the other direction (from the portable player to your computer). With this type of one-way sync partnership, Sync Center would copy all new music files it finds on your computer to the portable player, and delete any files from your portable player that you delete from your computer.

Two-way sync. You might set up two-way sync between a mobile device and a computer, where you instruct Sync Center to copy the newest version of any file it finds on your computer or device to the other location, overwriting any older versions of the same file. This is a good way to sync if you work with the same files on both the mobile device and computer, and you want to make sure you always have the most recent version of every file you've worked on, no matter which machine you are using. Two-way sync is commonly used in work environments, where files are often updated in more than one location and then synced with other locations.

Notes
  • During a two-way sync, Sync Center will alert you whenever it finds a conflict between files, which typically occurs when a file has changed in both locations since the last sync. Rather than overwrite either of the files that have been updated since the last sync, Sync Center asks you to resolve the conflict by telling it which version to sync with or by saving both versions. For more information, see Resolving sync conflicts: frequently asked questions.
  • The ability to sync with network folders is not included in Windows Vista Starter, Windows Vista Home Basic, and Windows Vista Home Premium.


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