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What is '.sync' folder?

Each folder added to Sync receives a system .sync folder (hidden by default), which, in turn, contains the Archive folder as well as several other files:

1. .sync folder (hidden by default).
2. .DS_Store (short for Desktop Services Store) is a hidden file created by OS X to store custom attributes of a folder such as the position of icons or the choice of a background image. (appears on Apple's OS X only).
3. The Archive folder stores old versions of files which were either deleted or modified on other devices in the course of syncing.
4. ID, IgnoreList, StreamsList:

  • ID represents the ID of the folder. It enables Sync to find the right peers and carry out syncing of the same folder added to Sync on other devices.
  • IgnoreList enables you to specify which files should be excluded from syncing (to learn how to edit IgnoreList, click here).
  • StreamsList is a file allowing you to "white list" alternate streams, xattrs and resource forks.

To read more about the Archive folder as well as Ignore List and StreamsList, click here.
5. User's files.

Having .sync in the folder is critical for syncing. Deleting .sync will result in Error 103.


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